[Feature] Add iOS App lifecycle basic support

[Kyle-Ye]

@main
struct ExampleApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
} 

[codecov]

Codecov Report

❌ Patch coverage is 0% with 88 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.43%. Comparing base (315d65c) to head (95565e1).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ces/OpenSwiftUI/App/Scene/PlatformSceneCache.swift	0.00%	44 Missing ⚠️
Sources/OpenSwiftUI/App/App/AppGraph.swift	0.00%	17 Missing ⚠️
Sources/OpenSwiftUI/App/Scene/SceneList.swift	0.00%	9 Missing ⚠️
Sources/OpenSwiftUI/App/Scene/SceneID.swift	0.00%	8 Missing ⚠️
Sources/OpenSwiftUI/App/Scene/SceneStorage.swift	0.00%	8 Missing ⚠️
...ces/OpenSwiftUI/Integration/PlatformItemList.swift	0.00%	1 Missing ⚠️
Sources/OpenSwiftUICore/Data/Util/Box.swift	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (315d65c) and HEAD (95565e1). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (315d65c)	HEAD (95565e1)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #761       +/-   ##
===========================================
- Coverage   26.65%   13.43%   -13.22%     
===========================================
  Files         645      617       -28     
  Lines       39108    35960     -3148     
===========================================
- Hits        10426     4833     -5593     
- Misses      28682    31127     +2445     

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