Add Intl.Collator and update String.localeCompare#2256
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Implement locale-aware string comparison: - Intl.Collator with sensitivity and numeric options - String.prototype.localeCompare delegation to Collator - CompareInfo/CompareOptions caching for performance - Support for all collation options per ECMA-402 Register Collator in IntlInstance. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Implement locale-aware string comparison: