Add live location sharing using Openstreetmap

Please implement the possibility to share the location using Openstreetmap.

I edit the issue to avoid creating a new one :)

- Users should be able to click a button in a chat to share their location with other users in that chat for a specified duration (share current location, share for 15 minutes, 1 hour, 8 hours).
- Users should not be able to share location in perpetuity due to the potential abuse vector and impact on battery life this represents.
- Location shares should render in the timeline.
- Clicking on any location-share event in the timeline should show a more detailed map view, including the locations of all users who are currently sharing their location in the chat.
- After location sharing has ended, the location-share event should show the most recently shared location.