Add From<Cow<'a, str>> for JsString

[CrazyboyQCD]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 53.75%. Comparing base (6ddc2b4) to head (ff55474).
Report is 344 commits behind head on main.

Files with missing lines	Patch %	Lines
core/string/src/lib.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4134      +/-   ##
==========================================
+ Coverage   47.24%   53.75%   +6.51%     
==========================================
  Files         476      485       +9     
  Lines       46892    48460    +1568     
==========================================
+ Hits        22154    26050    +3896     
+ Misses      24738    22410    -2328     

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[jedel1043]

Looks good! Thank you!