Fix view controller introspection

[rzulkoski]

• Updated UIKitIntrospectionViewController to also use its view's moveToWindowHandler when applying customizations.
• Updated both UIKitIntrospectionView and UIKitIntrospectionViewController to set their handlers up front in their respective makeUIView(Controller) methods rather than delaying it until updateUIView(Controller) is called.

[davdroman]

Are there any notable changes in behavior with this approach? Is the callback invoked slightly earlier (in terms of run loops) than it would if it was added on updateUIView?

[rzulkoski]

Hi David, I haven't noticed any changes in behavior except that I am now able to consistently find views and view controllers.

[nashfive]

I had a similar issue with my NavigationController callbacks not being called when navigating to my Views while a fullscreen cover was being dismissed. It felt too hacky to play with artificial delays... Switching to @rzulkoski fixed all my issues and my callbacks are now called propery.
When can these changes be incorporated ?

[danhalliday]

I can confirm this branch fixes a show-stopping bug in my project where a NavigationView was only being picked up about half the time.

[SplittyDev]

Looks pretty good, thanks! Wondering why the GitHub workflow isn't running..

[rzulkoski]

I think any tests related to List will fail due to iOS 16 switching to UICollectionView instead of UITableView.

[davdroman]

I've been granted maintainer access to this repo so I'm going to do my very best to get this merged ASAP. Right now, this PR is blocked by the issues reported in #179 so I'll try and take care of that first.