feat: Add missing JsTypedArray wrapper methods

[MayankRaj435]

This PR adds missing Rust wrapper methods for TypedArray in JsTypedArray and its subclasses, specifically resolving part of #3252.

Changes:

• Added entries(), keys(), values(), @@iterator() (using values), and toString() (using Array.prototype.toString).
• Changed visibility of entries and values in BuiltinTypedArray to pub(crate) to allow access from the wrappers.
• Added comprehensive unit tests in jstypedarray.rs verify the new methods.

All unit tests pass.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	49,901	49,901	0
Ignored	2,222	2,222	0
Failed	840	840	0
Panics	0	0	0
Conformance	94.22%	94.22%	0.00%

Tested main commit: 55786cef54cbd6a8d62dbb60ee5da9a7fdeebc63
Tested PR commit: abe311f0f648b6445ca297ef0b032a875a3c439d
Compare commits: 55786ce...abe311f

[MayankRaj435]

Hey @jedel1043 Can you please check this out and tell me if any change is needed?

[jedel1043]

Thank you. In the future we'd want to reevaluate the exact shape of the APIs because just returning JsValue is a bit painful to use, but just having the methods already brings a lot of value.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.47%. Comparing base (6ddc2b4) to head (abe311f).
⚠️ Report is 812 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5009       +/-   ##
===========================================
+ Coverage   47.24%   58.47%   +11.22%     
===========================================
  Files         476      559       +83     
  Lines       46892    61452    +14560     
===========================================
+ Hits        22154    35932    +13778     
- Misses      24738    25520      +782     

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