Update JellyfinAPI

[LePips]

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This PR servers as the (long) transition to the new async/await provided in the new JellyfinAPI.

I am developing this transition with the following steps:

1. remove jellyfin-sdk-swift
2. have a local copy of jellyfin-sdk-swift at version 0.1.0, rename folder to jellyfin-sdk-swift-legacy
3. rename the target to JellyfinAPILegacy
4. import as local package and update imports to JellyfinAPILegacy
5. add jellyfin-sdk-swift at version 0.2.0

This allows incremental updates instead of having to replace all of the calls at once before a successful build.

• [ ] make async/await wrappers
• [ ] inject some sort of session object into environment
  • this helps with resetting the app view on logout
• [ ] ActivityIndicator replacement
• [ ] refactor view models error handling
• [ ] replace calls...
  • might require slight adjustments to other views/callsites that require a full URL, like ImageView

[LePips]

After starting this a bit, I'm not so inclined to expedite this so that other features can be worked on. This will be in the background.

Edit: I'll actually wait until CreateAPI has sorting path parameters and paths organization, this will be very valuable now instead of rewriting later on when these are added.

[LePips]

Will be done in #593.