feat: add carplay and android auto support

[illuminati1911]

Adds support for Apple CarPlay and Android Auto.

• Added BaseAutoSceneDelegate for iOS and AndroidAutoBaseScreen for Android on a plugin level to manage setting up the base functionality for each platform.
• Added example of setting up each platform in the SampleApp. iOS SampleApp has a new separate target for CarPlay support SampleAppCarPlay.
• Added separate native module NavAutoModule to manage communication between RN code and the map instance.
• Added a generic event channel so that user actions can be sent from native code to RN. e.g. user presses a button in CarPlay window and this event is sent to RN code.
• Added a function to NavAutoModule to check whether CarPlay or Android Auto screen has been initialized and is available.

Resolves #177

• [x] Tests pass
• [x] Appropriate changes to documentation are included in the PR

[ArturoSalazarB16]

Hi! Thanks a lot for working on this Ville/Joonas. Moving forward, is it possible to create unitary PRs to make reviewing easier? and would also be easier to debug/investigate any possible issues.

Example: for this particular case, would it have been possible to split out Android Auto Vs CarPlay changes? we'd have different folks reviewing each platform, so that would also make it easier for them to track.

To not delay the feature, please don't block on this comment. It's more feedback for future changes.

[ArturoSalazarB16]

Hi @ShirwaM! If you get some bandwidth, can you please take a look at the iOS portion of the PR? (And also if you have any feedback around Android Auto implementation that would be amazing).

thanks! Arturo