Add AppearsActive and WindowEnvironment API

[Kyle-Ye]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.99%. Comparing base (826b129) to head (d38cced).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...iftUICore/Data/Environment/WindowEnvironment.swift	0.00%	15 Missing ⚠️
...enSwiftUICore/Data/Environment/AppearsActive.swift	0.00%	3 Missing ⚠️
...UICore/Data/Environment/EnvironmentAdditions.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #645      +/-   ##
==========================================
+ Coverage   29.96%   29.99%   +0.02%     
==========================================
  Files         552      554       +2     
  Lines       33306    33324      +18     
==========================================
+ Hits         9981     9996      +15     
- Misses      23325    23328       +3     

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