Multi-module project refactor

Implemented the multi-module refactor we discussed before to deprecate the sample-app branch.
Renamed MainActivity to AppActivity to better follow the Single Activity pattern.
Remove hardcoded library versions and updated some libraries due to conflicting versions.
Removed unused dependencies on various modules.
The contents of the SampleApp are within the example module. So this PR includes all that was made there.
The real App (the one not in the example module) doesn't have any UI but I left a TODO: Your UI starts here comment on the AppActivity.

I didn't moved the tv module to the example package to avoid conflicts with the current developments. But we can move it later easily.

rootstrap / android-base-compose