Use flutter_inappwebview instead of flutter_inappwebview_quill

[konnic]

singerdmx/flutter-quill#883
pichillilorenzo/flutter_inappwebview#1275

I suggest that this package depends on the original flutter_inappwebview package instead of the forked flutter_inappwebview_quill package.

Why?

• flutter_inappwebview_quill was created as a temporary workaround for an issue with Xcode14/iOS 16 betas, which has been fixed in flutter_inappwebview by this PR. Accordingly flutter_inappwebview_quill is not really actively maintained, while flutter_inappwebview is. Also there's no quill-specific logic inside the flutter_inappwebview_quill and the flutter_inappwebview package is already a major version ahead.
• flutter_quill_extensions and therefore youtube_player_flutter_quill cannot be used inside the same project as flutter_inappwebview, because of the dependency on flutter_inappwebview_quill. For more details see here.