[PR] MSSQL: support EXEC (@sql) dynamic SQL execution [datafusion-sqlparser-rs]

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

yoabot-droid opened a new pull request, #2234:
URL: https://github.com/apache/datafusion-sqlparser-rs/pull/2234

   ## Problem
   
   `EXEC (@sql)` — the T-SQL form for executing a dynamically-built SQL string — was failing to parse. `parse_execute()` was consuming a second parameter list after already parsing the parenthesised name expression, causing parse failures on any token that immediately followed.
   
   ## Fix
   
   Track whether the name expression was itself wrapped in parens. When it is (`EXEC (@sql)`), skip the parameter-list scan so no extra tokens are consumed.
   
   ## Test
   
   Adds `test_exec_dynamic_sql` covering:
   - `EXEC (@sql)` standalone
   - `EXEC (@sql)` followed by another statement on the next line


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