TelemetryDashboard: Add ROS 2 map widget

# Request

I want to view telemetry from my drone using the ROS 2 interface. This issue is for viewing the GPS position on the 2D map.

# Design Ideas

* Modify the map widget to support subscribing to the `/ap/navsatfix` topic using [roslibjs](https://github.com/RobotWebTools/roslibjs). I've used roslibjs, it's easy.
* Display the drones heading using `/ap/geopose` topic

Start by locating the existing TelemetryDashboard map widget and reviewing how it handles map data and roslibjs connections. Subscribe to `/ap/navsatfix` for the drone's GPS position and `/ap/geopose` for heading, then verify both are represented on the 2D map.

Written by the indexing model from the issue text.