Add liteModeEnabled (Google Maps), mapToolbarEnabled (Google Maps) and trackingMode (Apple Maps)

[Crhaj]

This PR adds support for the 'liteModeEnabled' & 'mapToolbarEnabled' properties of Google Maps and the 'trackingMode' property of Apple Maps. These properties have already been supported by the underlying platform-specific modules but this module didn't allow to pass these options.

I created this PR because I found myself in need of these properties and didn't want to install Google Maps and Apple Maps plugins separately. Let me know if you require some changes to it @LuisThein @jonbhanson, I think other people might have a similar issue as I did.

#26 (fixes the lite mode part of the issue)

Pre-launch Checklist

• [✓] I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy].
• [✓] I updated CHANGELOG.md to add a description of the change.
• [✓] I updated/added relevant documentation (doc comments with ///).
• [-] I added new tests to check the change I am making if a test is possible.
• [✓] All existing and new tests are passing.

[antalmate12]

Will this be merged? I'd love to use trackingMode

[KevinBeckers]

Is there any new about this merge? Would like to use tracking mode.