Update CollectionView to support anchoring an item

[mohamede1945]

No description provided.

[codecov]

Codecov Report

Attention: 667 lines in your changes are missing coverage. Please review.

Comparison is base (658b92f) 41.30% compared to head (ef55cae) 40.16%.

Files	Patch %	Lines
...iftUI/Epoxy/CollectionViewScrollToItemHelper.swift	0.00%	302 Missing ⚠️
...wiftUI/CollectionView/CollectionViewScroller.swift	0.00%	213 Missing ⚠️
...ftUI/CollectionView/CollectionViewDataSource.swift	0.00%	54 Missing ⚠️
...ftUI/CollectionView/CollectionViewController.swift	0.00%	49 Missing ⚠️
UI/UIx/SwiftUI/CollectionView/CollectionView.swift	0.00%	45 Missing ⚠️
UI/UIx/SwiftUI/Mutate.swift	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #623      +/-   ##
==========================================
- Coverage   41.30%   40.16%   -1.14%     
==========================================
  Files         521      525       +4     
  Lines       20627    21200     +573     
==========================================
- Hits         8520     8516       -4     
- Misses      12107    12684     +577     

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