Stop tasks and show task progress (#181)

* Add job status to tasks page

* Add support for stopping task

* Show progress of some tasks

graphql/documents/queries/settings/metadata.graphql

@@ -16,4 +16,16 @@ query MetadataGenerate($input: GenerateMetadataInput!) {
 
 query MetadataClean {
   metadataClean
+}
+
+query JobStatus {
+  jobStatus {
+    progress
+    status
+    message
+  }
+}
+
+query StopJob {
+  stopJob
 }