[June 2022] consider migration to SwiftUI

[tomholub]

Ok to give SwiftUI a try in the future but can't afford the code churn right now - need to get the app stable first.

Can evaluate it around June 2022, when our UI tests are comprehensive and we have spare dev cycles.

Originally posted by @tomholub in #766 (comment)

InvalidStorageViewController could be a good first candidate to test as it's small and not frequently encountered

[Kharchevskyi]

#1126 (comment)
Please keep in mind that swift ui mostly use observing pattern

[tomholub]

noted - thanks for mentioning it.

We'll tackle that once we start working on SwiftUI.