fix(utils): import ProgrammingError instead of bare exc. reference

`ParamEscaper.escape_args` and `ParamEscaper.escape_item` both raise
`exc.ProgrammingError(...)` but `exc` was never imported into utils.py.
On any unsupported parameter shape the user sees `NameError: name 'exc'
is not defined` instead of a clean PEP-249 `ProgrammingError`, masking
the actual problem.

Surfaced via the python-comparator audit harness running the
`INLINE_PARAMS` connection_config: both backends raised
`NameError: name 'exc' is not defined`, which the comparator's
class+message match treated as parity — a false-positive that hid both
the real driver bug and the underlying caller-side type mismatch.

Fix: import `ProgrammingError` directly from `databricks.sql.exc`
(matching the pattern used in `session.py`, `client.py`, `result_set.py`,
etc.) and replace the two `exc.ProgrammingError(...)` sites with bare
`ProgrammingError(...)`.

Signed-off-by: Vikrant Puppala <vikrant.puppala@databricks.com>

Author: vikrantpuppala

src/databricks/sql/utils.py

@@ -19,6 +19,7 @@
     pyarrow = None
 
 from databricks.sql import OperationalError
+from databricks.sql.exc import ProgrammingError
 from databricks.sql.cloudfetch.download_manager import ResultFileDownloadManager
 from databricks.sql.thrift_api.TCLIService.ttypes import (
     TRowSet,
@@ -548,7 +549,7 @@ def escape_args(self, parameters):
         elif isinstance(parameters, (list, tuple)):
             return tuple(self.escape_item(x) for x in parameters)
         else:
-            raise exc.ProgrammingError(
+            raise ProgrammingError(
                 "Unsupported param format: {}".format(parameters)
             )
 
@@ -606,7 +607,7 @@ def escape_item(self, item):
         elif isinstance(item, Mapping):
             return self.escape_mapping(item)
         else:
-            raise exc.ProgrammingError("Unsupported object {}".format(item))
+            raise ProgrammingError("Unsupported object {}".format(item))
 
 
 def inject_parameters(operation: str, parameters: Dict[str, str]):