Add support for signal api changes

Author: orkes-harshil

src/conductor/client/http/models/__init__.py

@@ -57,5 +57,4 @@
 from conductor.client.http.models.workflow_task import CacheConfig
 from conductor.client.http.models.schema_def import SchemaDef
 from conductor.client.http.models.schema_def import SchemaType
-from conductor.client.http.models.signal_response import SignalResponse
-from conductor.client.http.models.task_run import TaskRun
+from conductor.client.http.models.signal_response import SignalResponse, TaskStatus