Add Unicode and control character whitespace support in lexer #47
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T-SQL treats many characters as whitespace beyond standard ASCII spaces, including control characters (0x01-0x1F) and Unicode spaces. This adds proper handling for multi-byte UTF-8 whitespace sequences including Zero Width Space (U+200B) which Go's unicode.IsSpace doesn't include. Also fixes isLetter to only handle ASCII letters, preventing UTF-8 leading bytes from being incorrectly treated as identifier characters.
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T-SQL treats many characters as whitespace beyond standard ASCII spaces,
including control characters (0x01-0x1F) and Unicode spaces. This adds
proper handling for multi-byte UTF-8 whitespace sequences including
Zero Width Space (U+200B) which Go's unicode.IsSpace doesn't include.
Also fixes isLetter to only handle ASCII letters, preventing UTF-8
leading bytes from being incorrectly treated as identifier characters.