Graphite: Introduce new query types in annotation editor (#52341)

* Fix comment lines

* Introduce graphite variable editor

* Render results differently based on queryType

* Add comments and fallback values

* Unit tests for different type of graphite queries

* Use metrics/expand endpoint to retrieve metric names

packages/grafana-data/src/types/datasource.ts

@@ -94,9 +94,9 @@ export class DataSourcePlugin<
     return this.setQueryEditorHelp(ExploreStartPage);
   }
 
-  /*
+  /**
    * @deprecated -- prefer using {@link StandardVariableSupport} or {@link CustomVariableSupport} or {@link DataSourceVariableSupport} in data source instead
-   * */
+   */
   setVariableQueryEditor(VariableQueryEditor: any) {
     this.components.VariableQueryEditor = VariableQueryEditor;
     return this;