Compiler short circuits when validating schemas, not providing the full list of errors

[hysmio]

Hey! Noticed something while building while using extensions. It seems that Compile short circuits validation when errors occur in a document. I imagined that it would validate all schemas even if errors occurred in one.

This very well could be a design decision, but wanted to clarify.

4 fairly verbose examples can be found here:
https://goplay.tools/snippet/dhM5tkI82j1

The examples are:

1. returns meta missing properties

Actual output is the expected output

jsonschema file:///home/user/projects/golang-playground/schema.json compilation failed
[I#] [S#] doesn't validate with file:///home/user/projects/golang-playground/extension_meta.json#
  [I#] [S#/required] missing properties: 'foo', 'foobar'

2. returns https://json-schema.org/draft/2020-12/schema validation error, but not meta extension validation error

Actual output:

jsonschema file:///home/user/projects/golang-playground/schema2.json compilation failed
[I#] [S#] doesn't validate with https://json-schema.org/draft/2020-12/schema#
  [I#] [S#/allOf/3] allOf failed
    [I#] [S#/allOf/3/$ref] doesn't validate with 'https://json-schema.org/draft/2020-12/meta/validation#'
      [I#/minLength] [S#/properties/minLength/$ref] doesn't validate with '/$defs/nonNegativeIntegerDefault0'
        [I#/minLength] [S#/$defs/nonNegativeIntegerDefault0/$ref] doesn't validate with '/$defs/nonNegativeInteger'
          [I#/minLength] [S#/$defs/nonNegativeInteger/minimum] must be >= 0 but found -1

Expected output:

jsonschema file:///home/user/projects/golang-playground/schema2.json compilation failed
[I#] [S#] doesn't validate with https://json-schema.org/draft/2020-12/schema#
  [I#] [S#/allOf/3] allOf failed
    [I#] [S#/allOf/3/$ref] doesn't validate with 'https://json-schema.org/draft/2020-12/meta/validation#'
      [I#/minLength] [S#/properties/minLength/$ref] doesn't validate with '/$defs/nonNegativeIntegerDefault0'
        [I#/minLength] [S#/$defs/nonNegativeIntegerDefault0/$ref] doesn't validate with '/$defs/nonNegativeInteger'
          [I#/minLength] [S#/$defs/nonNegativeInteger/minimum] must be >= 0 but found -1
[I#] [S#] doesn't validate with file:///home/user/projects/golang-playground/extension_meta.json#
  [I#] [S#/required] missing properties: 'foo', 'foobar'

3. returns meta2 required properties error, but not meta#/foobar/minLength

Actual output: (this shows two children errors in one message)

jsonschema file:///home/user/projects/golang-playground/schema3.json compilation failed
[I#] [S#] doesn't validate with file:///home/user/projects/golang-playground/extension_meta.json#
  [I#] [S#/required] missing properties: 'foo'
  [I#/foobar] [S#/properties/foobar/minLength] length must be >= 3, but got 1

Expected output:

jsonschema file:///home/user/projects/golang-playground/schema3.json compilation failed
[I#] [S#] doesn't validate with file:///home/user/projects/golang-playground/extension_meta.json#
  [I#] [S#/required] missing properties: 'foo'
  [I#/foobar] [S#/properties/foobar/minLength] length must be >= 3, but got 1
[I#] [S#] doesn't validate with file:///home/user/projects/golang-playground/extension_meta_2.json#
  [I#] [S#/required] missing properties: 'bar'

4. **Validate returns the same singular meta error when calling .Error() but

DetailedOutput() returned the correct errors**
Actual output:

jsonschema: '' does not validate with file:///home/hayden/projects/golang-playground/schema4.json#/maximum: must be <= 8 but found 9

Expected output: (ValidationError.GoString())

[I#] [S#] doesn't validate with file:///home/hayden/projects/golang-playground/schema4.json#
  [I#] [S#/maximum] must be <= 8 but found 9
  [I#] [S#/foobar] when foo is bar, numbers must be >= 10, but got 9

I've created a PR here for Compile supporting multiple errors.

For ValidationError.Error() I would suggest using GoString or creating a way to show multiple errors.