fix(engine/sqlite): fix table_alias rules #2465
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fix #2271
In the current grammar, the LEFT part of LEFT JOIN was recognized as table_alias.
lemon has a fallback directive that treats it as a KEYWORD and treats it as an identifier if parsing fails.
ref: https://sqlite.org/src/doc/trunk/doc/lemon.html#pfallback
The rule has been modified to match this behavior.
Add a table_alias_fallback rule that also includes KEYWORD to lower the precedence to match SQLite's behavior.