Record activity events

Batch insert (max 500 per call) from the desktop app. Rejected with 403 unless the caller has activityEnabled. entryId, when given, must belong to the caller. appName is truncated to 200 chars, windowTitle to 500.

curl -X POST "https://example.com/v1/activity/events" \  -H "Content-Type: application/json" \  -d '{    "events": [      {        "startedAt": "2019-08-24T14:15:22Z",        "endedAt": "2019-08-24T14:15:22Z"      }    ]  }'

{  "created": 0}