Add ConcatenatedTextStorage

[Kyle-Ye]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.85%. Comparing base (a68507a) to head (18420c2).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ces/OpenSwiftUICore/View/Text/Text/Text+Text.swift	0.00%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #652      +/-   ##
==========================================
- Coverage   29.90%   29.85%   -0.06%     
==========================================
  Files         558      559       +1     
  Lines       33455    33479      +24     
==========================================
- Hits        10005     9994      -11     
- Misses      23450    23485      +35     

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