Implementing the new "get_metrics_data" function

.circleci/config.yml

@@ -95,6 +95,6 @@ workflows:
           matrix:
             parameters:
               python_version: ["min-python", "max-python"]
-  lint:
+  linting:
     jobs: 
       - lint

xdmod_data/warehouse.py

@@ -156,6 +156,53 @@ def get_data(
             params,
             response.text,
         )
+
+    def get_metrics_data(
+        self,
+        date_range,
+        realm,
+        metric,
+        group_by,
+        dataset_type,
+        aggregation_unit,
+        include_only,
+        exclude
+    ):
+
+    _validator._assert_runtime_context(self.__in_runtime_context)
+
+    if isinstance(metric, list):
+        raise NotImplementedError("metric as a list is not yet implemented")
+
+    if isinstance(group_by, (list, dict)):
+        raise NotImplementedError("group_by as a list or dict is not yet implemented")
+
+    if exclude:
+        raise NotImplementedError("exclude is not yet implemented")
+
+    translated_params = {
+        'duration': date_range,
+        'realm': realm,
+        'metric': metric,
+        'dimension': group_by,
+        'filters': include_only,
+        'dataset_type': dataset_type,
+        'aggregation_unit': aggregation_unit,
+    }
+
+    params = _validator._validate_get_data_params(
+        self,
+        self.__descriptors,
+        translated_params,
+    )
+
+    response = self.__http_requester._request_data(params)
+
+    return _response_processor._process_get_data_response(
+            self,
+            params,
+            response.text,
+        )
 
     def get_raw_data(
         self,