add metadata command unit tests

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/backend/filters.py

@@ -17,7 +17,6 @@
     TYPE_CHECKING,
 )
 
-from databricks.sql.utils import JsonQueue, SeaResultSetQueueFactory
 from databricks.sql.backend.types import ExecuteResponse, CommandId
 from databricks.sql.backend.sea.models.base import ResultData
 from databricks.sql.backend.sea.backend import SeaDatabricksClient