feature(mobile): add offline support

[fyfrey]

This PR mostly changes mobile:

• Adds Isar DB
• Asset is now a DB entity and contains all required fields, no longer stored an AssetResponseDto internally
• Replacing caching as JSON with storing in local DB
• Replaces usage of AssetResponseDto with Asset: To unify viewing local/remote assets
• Replaces usage of CachedNetworkImage with ImmichImage: To show Assets instead of only remote AssetResponseDtos
• New class Album: DB entity, can be both device local and remote
• Replace usage of AlbumResponseDto with Album
• New class User: DB entity, equivalent to server entity
• New class Value: DB entity to store different single values (string/json/int) in a DB table, for configuration settings, logged in user id etc.
• Syncs changes 1-way: from server to client (minus bugs), this includes new albums/assets, modified albums/assets, removing albums/assets
• Allows to browse (read-only) the app while offline: Making modifications such as adding assets to an album etc. does not work yet
• Shows device albums on the library page in a new section
• replace a few API calls with lookups in the local DB (e.g. getting users to share an album with)
• adds a modifedAt column to the server Album entity
• very likely added new bugs :-)
• probably a lot more that I forgot to mention here

To test this, you need to run flutter pub run build_runner build to generate the Isar files (currently not included in the repo, but we could do that)

Since this changeset is already huge, any more advances offline functionalities enabled by this change are planned as follow-up PRs such as:

• Making modifications offline and syncing 2-way (from server to client and vice versa)
• Moving the whole compute intense asset handling (like downloading the list of assets or finding assets on device and combining both) to a its own isolate independent of the UI isolate
• Reading chunks from the local DB while scrolling instead of loading everything
• Replace some Hive boxes with Isar table(s): Enable concurrent access from multiple isolates which Hive does not support
• Concurrent background backup: background and foreground isolates can now work concurrently since Isar DB can be concurrently accessed from multiple isolates

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[bo0tzz]

Awesome stuff!

To test this, you need to run flutter pub run build_runner build to generate the Isar files (currently not included in the repo, but we could do that

Is this always required to build the app? If so, we should add that step to the CI app build workflow (or include those files in the repo)

[fyfrey]

Superseded by #1539 #1561 #1574 #1759 #1932