iOS modify lifecycle and containment

[elijah-semyonov]

Proposed Changes

Define state of being alive for CMPViewController as an interval from the first viewWillAppear until a moment where following criteria is met:

1. Not rootViewController of any connected scene UIWindow.
2. Not transitively or directly contained by any UIViewController passing (1), via either parent<->child or presenting<->presented chain.

Testing

Test: CMPViewControllerTests.swift in CMPUIKitUtils, ProperContainmentDisposal in ComposeDemo.

Issues Fixed

Fixes: JetBrains/compose-multiplatform#4188