feat: add async unsupported paramater exception (#694)

* feat: add async unsupported paramater exception

* Update google/api_core/exceptions.py

Co-authored-by: Victor Chudnovsky <vchudnov@google.com>

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---------

Co-authored-by: Victor Chudnovsky <vchudnov@google.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: 3 people

google/api_core/exceptions.py

@@ -442,6 +442,12 @@ class DeadlineExceeded(GatewayTimeout):
     grpc_status_code = grpc.StatusCode.DEADLINE_EXCEEDED if grpc is not None else None
 
 
+class AsyncRestUnsupportedParameterError(NotImplementedError):
+    """Raised when an unsupported parameter is configured against async rest transport."""
+
+    pass
+
+
 def exception_class_for_http_status(status_code):
     """Return the exception class for a specific HTTP status code.