We need to migrate from deprecated react-native-fabric to react-native-firebase.
This PR enables following Firebase features:
* Analytics
* Crashlytics
* Performance

It also tracks screen view without the necessity of HOC.

Future work:
I won't do it in this PR because it's large enough, but we need to log more app events, like 'sent_message', 'open_admin', 'media_upload', etc.

- Refactored Message component to use React.memo and re-render only what's necessary
- Added a test mode to toggle markdown parse by long press drawer (it'll be removed in the next release)

Closes #826
Closes #827
Closes #828
Closes #829
Closes #830
Closes #831
Closes #832
Closes #833