Add recordpanel beside datagrid

releasenotes/notes/datagrid-record-panel-6d2b9e4a1c7f8350.yaml

@@ -0,0 +1,9 @@
+---
+features:
+  - |
+    Data grids in the table editor and in query results now have a record
+    panel next to the grid. It shows the column name, type and value of the
+    current row, long text, varchar, json, jsonb and xml values get an
+    expandable multi-line box. Values are editable exactly when the grid cell
+    is editable. The panel can be hidden with the :menuselection:`Record`
+    button.