Support for GeometryCollection

[FarhanSajid1]

I was attempting to display a geometry collection using mapbox and ran up the stack until I saw the geometry model in this package, it appears it does not have the geometries field necessary for handling GeometryCollections.

Current logic

  factory Geometry({
    String? type,
    dynamic coordinates,
  }) =>
      Geometry.fromJsObject(GeometryJsImpl(
        type: type,
        coordinates: coordinates,
      ));

  /// Creates a new Geometry from a [jsObject].
  Geometry.fromJsObject(GeometryJsImpl jsObject) : super.fromJsObject(jsObject);

I believe this needs to be updated to something like

  factory Geometry({
    String? type,
    dynamic coordinates,
    dynamic geometries
  }) =>
      Geometry.fromJsObject(GeometryJsImpl(
        type: type,
        coordinates: coordinates,
       geometries: geometries,
      ));

I've created the corresponding issue in the mapbox-gl-web repo:
flutter-mapbox-gl/maps#1017

An example of the type of data this will server would be:

{
    "geometry": {
        "geometries": [
            {
                "coordinates": [
                    -73.9378039,
                    40.6067712
                ],
                "type": "Point"
            },
            {
                "coordinates": [
                    -73.9377864,
                    40.6069361
                ],
                "type": "Point"
            },
            {
                "coordinates": [
                    -73.9377368,
                    40.6071001
                ],
                "type": "Point"
            },
            {
                "coordinates": [
                    -73.937714,
                    40.6062835
                ],
                "type": "Point"
            },
            {
                "coordinates": [
                    -73.9376657,
                    40.6072579
                ],
                "type": "Point"
            },
            {
                "coordinates": [
                    -73.9376429,
                    40.6061267
                ],
                "type": "Point"
            },
            {
                "coordinates": [
                    [
                        [
                            -73.9276617,
                            40.5970339
                        ],
                        [
                            -73.9275492,
                            40.5969335
                        ],
                        [
                            -73.9277521,
                            40.5968025
                        ],
                        [
                            -73.9278645,
                            40.5969029
                        ],
                        [
                            -73.9276617,
                            40.5970339
                        ]
                    ]
                ],
                "type": "Polygon"
            },
            {
                "coordinates": [
                    [
                        [
                            -73.9276726,
                            40.5970446
                        ],
                        [
                            -73.9278759,
                            40.5969146
                        ],
                        [
                            -73.9279879,
                            40.5970156
                        ],
                        [
                            -73.9277846,
                            40.5971456
                        ],
                        [
                            -73.9276726,
                            40.5970446
                        ]
                    ]
                ],
                "type": "Polygon"
            },
            {
                "coordinates": [
                    [
                        [
                            -73.927182,
                            40.6058754
                        ],
                        [
                            -73.9273275,
                            40.6061209
                        ],
                        [
                            -73.9270803,
                            40.6062806
                        ],
                        [
                            -73.9268595,
                            40.606083
                        ],
                        [
                            -73.927182,
                            40.6058754
                        ]
                    ]
                ],
                "type": "Polygon"
            },
            {
                "coordinates": [
                    [
                        [
                            -73.9277674,
                            40.59679
                        ],
                        [
                            -73.9279722,
                            40.5966571
                        ],
                        [
                            -73.9280864,
                            40.5967585
                        ],
                        [
                            -73.9278815,
                            40.5968914
                        ],
                        [
                            -73.9277674,
                            40.59679
                        ]
                    ]
                ],
                "type": "Polygon"
            },
            {
                "coordinates": [
                    [
                        [
                            -73.9280046,
                            40.5970042
                        ],
                        [
                            -73.9278942,
                            40.5969041
                        ],
                        [
                            -73.9281026,
                            40.5967715
                        ],
                        [
                            -73.9282131,
                            40.5968715
                        ],
                        [
                            -73.9280046,
                            40.5970042
                        ]
                    ]
                ],
                "type": "Polygon"
            },
            {
                "coordinates": [
                    [
                        [
                            -73.9380157,
                            40.606164
                        ],
                        [
                            -73.9379062,
                            40.6060636
                        ],
                        [
                            -73.9381631,
                            40.605902
                        ],
                        [
                            -73.9382726,
                            40.6060023
                        ],
                        [
                            -73.9380157,
                            40.606164
                        ]
                    ]
                ],
                "type": "Polygon"
            },
            {
                "coordinates": [
                    [
                        [
                            -73.936987,
                            40.608681
                        ],
                        [
                            -73.9366055,
                            40.6089156
                        ],
                        [
                            -73.9362013,
                            40.6085366
                        ],
                        [
                            -73.9365828,
                            40.6083021
                        ],
                        [
                            -73.9367915,
                            40.6084978
                        ],
                        [
                            -73.936987,
                            40.608681
                        ]
                    ]
                ],
                "type": "Polygon"
            }
        ],
        "type": "GeometryCollection"
    },
    "type": "Feature",
    "properties": {}
    }
}

Is this something that is on the roadmap, are there any limitations of adding this? I can image that if the coordinates are null, things might break