[PR] MSSQL: prevent statement-starting keywords from being consumed as implicit aliases [datafusion-sqlparser-rs]

["yoabot-droid (via GitHub)" <gi...@apache.org>]

yoabot-droid opened a new pull request, #2233:
URL: https://github.com/apache/datafusion-sqlparser-rs/pull/2233

   ## Problem
   
   In T-SQL multi-statement scripts delimited by newlines, the parser was consuming statement-starting keywords (`DECLARE`, `EXEC`/`EXECUTE`, `INSERT`, `UPDATE`, `DELETE`, `DROP`, `CREATE`, `ALTER`, `TRUNCATE`, `PRINT`, `WHILE`, `RETURN`, `THROW`, `RAISERROR`, `MERGE`) as implicit aliases for the preceding `SELECT` item or table reference, then failing on the next token.
   
   ## Fix
   
   Extended `is_select_item_alias()` and `is_table_factor_alias()` in `MsSqlDialect` to return `false` for all of these keywords, matching the existing treatment of `IF` and `ELSE`.
   
   ## Test
   
   Adds `test_tsql_statement_keywords_not_implicit_aliases` covering column and table alias cases across the full affected keyword set.


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