Added support for sorting key-value pairs in the performance testing example).

[jayshah1819]

Changes Made

• Implemented payload buffer handling for key-value pair sorting
• Added validation for sorted pairs(causing issues)
• Fixed WGSL shader compilation errors( In WGSL, let creates immutable bindings.)

Validation Memory Limitation

Issue:
Validation fails for large arrays (>2^26 elements) due to memory constraints when creating combined {key, value} objects.

Testing

• Tested(2^25) - Array.from approach
• Tested(2^27) - index based approach
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