Add Observation support

[Kyle-Ye]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 5.40541% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 24.59%. Comparing base (a8b4397) to head (453b346).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...esentable/Platform/PlatformViewRepresentable.swift	0.00%	17 Missing ⚠️
...tUICore/Data/DynamicProperty/DynamicProperty.swift	18.18%	9 Missing ⚠️
...enSwiftUICore/Layout/Geometry/GeometryReader.swift	0.00%	3 Missing ⚠️
.../Environment/EnvironmentKeyTransformModifier.swift	0.00%	2 Missing ⚠️
.../Data/Preference/PreferenceTransformModifier.swift	0.00%	2 Missing ⚠️
Sources/OpenSwiftUI/Util/AnyAttributeFix.swift	0.00%	1 Missing ⚠️
Sources/OpenSwiftUICore/Util/AnyAttributeFix.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
+ Coverage   16.22%   24.59%   +8.37%     
==========================================
  Files         445      470      +25     
  Lines       25025    27222    +2197     
==========================================
+ Hits         4060     6695    +2635     
+ Misses      20965    20527     -438     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Kyle-Ye]

Close #477