Add Latin1 Encoding Check in from Method

[rajat552]

Summary

This pull request introduces a check for Latin1 encoding in the from method of the JsString implementation. Previously, the method only handled ASCII strings, but this update extends support to strings containing characters within the Latin1 range (0x00 to 0xFF).

Changes

• Added a condition to check whether all characters in the input string fall within the Latin1 range.
• Updated the from method to handle Latin1-compatible strings by converting them to JsStr::latin1.

Testing

• Ran the full test suite to verify the changes.
• All existing tests passed successfully, confirming that no regressions were introduced.

Impact

This change improves string handling by allowing the from method to support Latin1-encoded strings. As a result, the implementation becomes more robust and capable of handling a wider range of character inputs efficiently.

Closes #4944

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	49,687	49,687	0
Ignored	2,262	2,262	0
Failed	1,014	1,014	0
Panics	0	0	0
Conformance	93.81%	93.81%	0.00%

Tested main commit: 34ca7f1f404c2712d6897c3e39e5f5e981ce9ed6
Tested PR commit: 38660e8322f49c0d3974f7a718f93d8884c557e6
Compare commits: 34ca7f1...38660e8

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.95%. Comparing base (6ddc2b4) to head (38660e8).
⚠️ Report is 779 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4945       +/-   ##
===========================================
+ Coverage   47.24%   57.95%   +10.71%     
===========================================
  Files         476      557       +81     
  Lines       46892    60962    +14070     
===========================================
+ Hits        22154    35331    +13177     
- Misses      24738    25631      +893     

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[rajat552]

@jedel1043 review this PR let me know if any changes required