provide default setting for kernel activity

packages/console-extension/schema/tracker.json

@@ -37,6 +37,13 @@
       "type": "string",
       "enum": ["notebook", "terminal"],
       "default": "notebook"
+    },
+    "kernelActivity": {
+      "title": "Kernel activity",
+      "description": "Whether the console should show all or minimal kernel activity",
+      "type": "string",
+      "enum": ["all", "minimal"],
+      "default": "minimal"
     }
   },
   "additionalProperties": false,