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Fix `TRegexLexer` performance. Now it is just 2 times slower than a reference ANTLR implementation on Release mode, so merged regexes are 3 times better than scan&compare.

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- Related to `YQL-19616`
- Related to https://github.com/ydb-platform/ydb/issues/15129
- Related to https://github.com/vityaman/ydb/issues/42
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Pull Request resolved: https://github.com/ytsaurus/ytsaurus/pull/1278
commit_hash:1529f641172fea13f0d33fbfd06a4827c6efde01
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