[Feat] Removing the default RTLTextPlugin

[KiwiKilian]

Target Use Case

As previously discussed, I would like to remove the default RTL plugin loaded from mapbox.com.

From a data privacy point it would be much superior to remove the default and let the developer specify a source, if RTL support is needed. No alternative default should be specified.

Proposal

I'm happy to draft a PR with the default value for RTLTextPlugin removed. Is a breaking change fine within this initial release or would this only be going in for 2.0?

I would also like to change the shape of the prop, providing full control:

RTLTextPlugin={{
  pluginUrl: "...",
  lazy: true,
}}