[WIP][v1.46.0] Search screen overhaul

This release implements the proposal discussed here: https://lemmy.world/post/21570953.

This release overhauls the search screen to show subscribed communities and community suggestions based on what is popular or trending at the moment.

Note: Suggestions shown in the search screen will be based on data gathered from Lemmy servers (more precisely they are based off of https://github.com/tgxn/lemmy-explorer). They are not from data generated from the client. The app does not track/send data to any servers aside from Lemmy & Firebase (for crash/app stability tracking, you can opt-out in settings).

The backend portion that will drive community suggestions feature is open source. You can view it here: https://github.com/idunnololz/summit-for-lemmy-server.

I will issue more details regarding how this will all be set up once I'm closer to a release.

Changes so far

• Complete search screen overhaul
• Fixed a bug where disabling Firebase Crashlytics would leave the rest of the Firebase library enabled which can include components such as a logger.