Split MAS into smaller submodules

[zugaldia]

This PR brings the following changes to MAS:

• libjava and libandroid now live under the same (Android Studio) project.
• These projects are now split up into: libjava-core, libjava-geojson, libjava-services, libjava-services-rx, libandroid-telemetry, libandroid-services, libandroid-ui, and app.
• All but app will be published independently to Maven.
• No code has been changed, except to adjust package names (which I've tried to respect the best I could).

Pending:

• libjava-services-rx (see Support RxJava #131) and libandroid-telemetry are placeholders for now.
• Port all gradle settings (like publish to Maven Central, checkstyle).
• Update CI (Bitrise settings)

@mapbox/android Still a WIP but open for feedback.

[zugaldia]

Alright, everything should be working now like before.

@tobrun @cammace great if I could get your 👀 here. I know this is a massive PR, but great if at least you can detect red flags now, we can polish the rest later in separate tickets. There are no changes to code, just to the organization of the packages into more and smaller submodules. If it helps, I just published SNAPSHOTS for all the modules and they're available on https://oss.sonatype.org/content/repositories/snapshots/com/mapbox/mapboxsdk/ (no actual releases on Maven yet).

• libandroid-services: Equivalent to the previous android-services.
• libandroid-telemetry: Future container for extracted telemetry.
• libandroid-ui: UI components, for now, just the Geocoder Autocomplete.
• libjava-core: Just models.
• libjava-geojson: So that the SDK doesn't need to include code it doesn't need for the Runtime Styling implementation.
• libjava-services: Equivalent to the previous java-services.
• libjava-services-rx: RxJava extensions (to bring them back)

libjava-services-rx and libandroid-telemetry will be tackled in a separate ticket.

[cammace]

👏 Works successfully in the demo app