Implement FacetGrid

[moodymudskipper]

Closes #525

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[moodymudskipper]

I don't get this. We have this error:

❯ checking for missing documentation entries ... WARNING
Undocumented code objects:
‘opts_FacetGrid’
All user-level objects in a package should have documentation entries.
See chapter ‘Writing R documentation files’ in the ‘Writing R
Extensions’ manual.

But the object is documented properly :

#' @export
#' @rdname other-opts
opts_FacetGrid <- function(constructor = c("facet_grid", "ggproto", "next", "environment"), ...) {
  .cstr_options("FacetGrid", constructor = constructor[[1]], ...)
}

Anf we can check the doc without problem