Fix connection busy race condition - #470
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…er command' error This commit addresses issue aio-libs#468 where concurrent cursor operations on the same connection could cause race conditions leading to the error: 'DBAPIError: (pyodbc.Error) (HY000, [HY000] [Microsoft][ODBC Driver 18 for SQL Server]Connection is busy with results for another command (0))' Changes made: - Added asyncio.Lock to Connection class to synchronize cursor operations - Protected cursor creation and cleanup with the lock to prevent race conditions - Enhanced error detection in utils.py to handle 'Connection is busy' errors - Added comprehensive tests to verify the fix works correctly The fix ensures that: 1. Cursor operations are properly serialized 2. Cleanup operations don't interfere with new cursor creation 3. The 'Connection is busy' error is properly detected and handled 4. Backward compatibility is maintained Fixes aio-libs#468
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