Add keyboard shortcuts for focus on current query and go to next output query tab (#1153)

* add go to next output query tab shotcut

* add a new keyboard shortcut for focus on current query

* minor change

src/sql/parts/grid/common/gridContentEvents.ts

@@ -17,3 +17,4 @@ export let SelectAllMessages = 'SelectAllMessages';
 export let SaveAsCsv = 'SaveAsCSV';
 export let SaveAsJSON = 'SaveAsJSON';
 export let SaveAsExcel = 'SaveAsExcel';
+export let GoToNextQueryOutputTab = 'GoToNextQueryOutputTab';