Update Benchmark and Test API

[Kyle-Ye]

Follow up of #343

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 396 lines in your changes missing coverage. Please review.

Project coverage is 21.33%. Comparing base (0a8f32c) to head (1e40f43).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/OpenSwiftUI/Test/ViewTest.swift	0.00%	153 Missing ⚠️
...iftUI/View/IdentifiedView/IdentifiedModifier.swift	0.00%	35 Missing ⚠️
Sources/OpenSwiftUI/Test/TestApp+Test.swift	0.00%	33 Missing ⚠️
...Core/View/IdentifiedView/IdentifiedViewProxy.swift	0.00%	33 Missing ⚠️
...SwiftUICore/Data/Preference/PreferenceValues.swift	0.00%	31 Missing ⚠️
...urces/OpenSwiftUI/App/OpenSwiftUIApplication.swift	0.00%	19 Missing ⚠️
.../Data/Preference/PreferenceTransformModifier.swift	0.00%	14 Missing ⚠️
Sources/OpenSwiftUICore/Test/TestApp.swift	0.00%	14 Missing ⚠️
.../OpenSwiftUICore/Test/AttributeCountTestInfo.swift	0.00%	11 Missing ⚠️
...ntegration/Hosting/AppKit/View/NSHostingView.swift	0.00%	9 Missing ⚠️
... and 10 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #345      +/-   ##
==========================================
- Coverage   21.72%   21.33%   -0.40%     
==========================================
  Files         367      373       +6     
  Lines       19188    19535     +347     
==========================================
- Hits         4169     4167       -2     
- Misses      15019    15368     +349     

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