SDK - Client - Added API models to the generated API (#2418)

* SDK - Client - Added API models to the generated API

The API objects should now be available in the generated client API: `kfp.Client().jobs.models.ApiJob`.

* Simplified the change

sdk/python/kfp/_client.py

@@ -53,14 +53,19 @@ def camel_case_to_snake_case(name):
       short_api_name = camel_case_to_snake_case(api_name[0:-len('ServiceApi')]) + 's'
       api_struct = Struct()
       setattr(target_struct, short_api_name, api_struct)
-      service_api = getattr(api_module, api_name)
+      service_api = getattr(api_module.api, api_name)
       initialized_service_api = service_api(api_client)
       for member_name in dir(initialized_service_api):
           if member_name.startswith('_') or member_name.endswith('_with_http_info'):
               continue
 
           bound_member = getattr(initialized_service_api, member_name)
           setattr(api_struct, member_name, bound_member)
+  models_struct = Struct()
+  for member_name in dir(api_module.models):
+      if not member_name[0].islower():
+          setattr(models_struct, member_name, getattr(api_module.models, member_name))
+  target_struct.api_models = models_struct
 
 
 KF_PIPELINES_ENDPOINT_ENV = 'KF_PIPELINES_ENDPOINT'
@@ -93,7 +98,7 @@ def __init__(self, host=None, client_id=None, namespace='kubeflow'):
     self._uihost = os.environ.get(KF_PIPELINES_UI_ENDPOINT_ENV, host)
     config = self._load_config(host, client_id, namespace)
     api_client = kfp_server_api.api_client.ApiClient(config)
-    _add_generated_apis(self, kfp_server_api.api, api_client)
+    _add_generated_apis(self, kfp_server_api, api_client)
     self._run_api = kfp_server_api.api.run_service_api.RunServiceApi(api_client)
     self._experiment_api = kfp_server_api.api.experiment_service_api.ExperimentServiceApi(api_client)
     self._pipelines_api = kfp_server_api.api.pipeline_service_api.PipelineServiceApi(api_client)