Add GPS panel query/support to Grafana integration

User story tbd

Acceptance criteria

Using the TrackMap plugin
For local host Grafana, can install the plugin using a terminal command:
```
grafana-cli plugins install pr0ps-trackmap-panel
```
For remote-host Grafana, create instructions for how to add the plugin.
Detect from the sensor that this is a GPS sensor when the sensor is created in the UI

Build special SQL query for the TrackMap plugin:

SELECT timestamp as "time",
    cast(value->'result'->'latitude' AS float) AS lat,
    cast(value->'result'->'longitude' AS float) AS lon
    FROM ag_data_agmeasurement
    WHERE $__timeFilter("timestamp")
    AND sensor_id_id=1
    AND "event_uuid_id"='f64d1e21-22f7-4245-8a2d-dcbb7fef8df9'
    ORDER BY timestamp

Definition of Done tbd

gcivil-nyu-org / spring2020-cs-gy-9223-class

Add GPS panel query/support to Grafana integration #535