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FIX: sort strings in UTF-8 encoded byte order#2275
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The semantics of this logic were originally fixed by #2275, but this fix caused a material performance degradation, which was then improved by #2299 The performance was, however, still suboptimal, and this PR further improves the speed back to close to its original speed and, serendipitously, simplifies the algorithm too. This commit is a port of firebase/firebase-js-sdk#9143
This was referenced Jul 7, 2025
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Strings should be sorted in UTF-8 encoded byte order. Public document: https://cloud.google.com/firestore/docs/concepts/data-types#data_types
SDK sorts strings using built in comparator method, which sorts lexicographically, and leads to mismatch between server and sdk when special characters are present. This PR fixes the string order mismatches on document field, map key, and document key.