Convert Indexer Stats to Typescript

frontend/src/App/State/IndexerStatsAppState.ts

@@ -0,0 +1,11 @@
+import { AppSectionItemState } from 'App/State/AppSectionState';
+import { Filter } from 'App/State/AppState';
+import { IndexerStats } from 'typings/IndexerStats';
+
+export interface IndexerStatsAppState
+  extends AppSectionItemState<IndexerStats> {
+  selectedFilterKey: string;
+  filters: Filter[];
+}
+
+export default IndexerStatsAppState;