Region Picker concurrency overhaul

[ualch9]

OBAKit Changes

• New RegionPicker onboarding view (and, replaces RegionPickerViewController).
  • Add a "preview" map, for additional context on what a region is. If the view gets too distracting, it may be collapsed.
  • Add a inactive/experimental regions filter (fixes #633).
• New CustomRegionForm (replaces CustomRegionBuilderController, etc.).
  • Add RenamableNavigationTitle, a polyfill for iOS 16's navigationTitle editing.
• Add View.errorAlert for displaying an error alert, regardless of whether the error is localized or not.
• Add LocalizedAlertError, for creating a LocalizedAlert for is LocalizedAlert or is not LocalizedAlert.

UI recordings

Map	Filter	Custom Region

A delete action appears when editing a region. The delete button is disabled if it is the currently selected region.

Automatically choose region makes the region selection and disables the Picker.

About LocalizedAlertError

Normally, a is not LocalizedAlert will have an error description of just This operation couldn't be completed. LocalizedAlertError will instead create an error description using the name of the specific Error class/struct/enum, this makes it easier for developers to pinpoint the error location.

OBAKitCore changes

• Updated RegionAPIService to Concurrency
• API response handling code is moved from class RESTAPIService to any [protocol] APIService.
  • Add APIService.getData(for:)
  • Add APIService.getData(for:decodeAs:using:)

OBAKitTests changes

• Overhaul RegionAPIService unit tests (tldr: use async and swift enums, instead of waitUntil).
• Added DelegateTestingHelper.DidCallDelegateMethod to OBAKitTests.

Old recording

https://user-images.githubusercontent.com/22162410/212872734-5c3fcfbd-ac81-4da4-98eb-e4e78670d1bf.mov

[ualch9]

Hm, want to try one more thing with one-time location authorization...

[ualch9]

Hm, want to try one more thing with one-time location authorization...

Never mind, ready for review.

[aaronbrethorst]

@ualch9 can you take a quick pass through the commits here and squash where appropriate?

[ualch9]

Rebased, added some comments, and fixed some localization. I hope this helps with your review.

[aaronbrethorst]

@ualch9 awesome, I'll review today.

[aaronbrethorst]

Awesome thanks @ualch9!