feat: Add windowId common definition type

This adds a new type called `windowId` which uniquely identifies
an IDE window. It is possible to have multiple windows of the same
IDE openened at the same time, and this should differentiate them.

The plan is to attach this value to all telemetry events.

Signed-off-by: Nikolas Komonen <[email protected]>

Author: nkomonen-amazon

telemetry/definitions/commonDefinitions.json

@@ -1473,6 +1473,11 @@
             "type": "string",
             "description": "A token used for flow metrics to link calls together"
         },
+        {
+            "name": "windowId",
+            "type": "string",
+            "description": "An identifier for a specific IDE window, since there can be multiple windows from the same IDE open on a machine."
+        },
         {
             "name": "xrayEnabled",
             "type": "boolean",