Add Update implementation

[Kyle-Ye]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 42 lines in your changes are missing coverage. Please review.

Project coverage is 16.10%. Comparing base (8eae479) to head (845d191).

❗ Current head 845d191 differs from pull request most recent head 0b5881f. Consider uploading reports for the commit 0b5881f to get more accurate results

Files	Patch %	Lines
Sources/OpenSwiftUI/Core/Update/Update.swift	0.00%	36 Missing ⚠️
Sources/OpenSwiftUI/Core/Log/Signpost.swift	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   16.25%   16.10%   -0.15%     
==========================================
  Files         164      166       +2     
  Lines        3304     3334      +30     
==========================================
  Hits          537      537              
- Misses       2767     2797      +30     

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