Create Tile showcasing multiple timeline entries

[ataulm]

The 3 tiles we have today only show a single entry: fitness, messaging, playNext.

Create a calendar event tile with multiple entries to showcase its usage.

[yschimke]

Consider using one of the current ones, maybe it's enough to fallback from fitness tile with an active activity, to a blank one to launch an activity. Sort of like a TTL, if app is running it keeps changing the tile. Once it stops the activity clears after some TTL.