Request browser wake lock when location is being tracked

[hiddewie]

Fixes #967

If the user has enabled location tracking, the UI will request the browser to disable sleep.

See https://developer.chrome.com/docs/capabilities/web-apis/wake-lock
See https://stackoverflow.com/questions/6106747/can-i-prevent-phone-from-sleep-on-a-webpage
See https://w3c.github.io/screen-wake-lock/
See https://maplibre.org/maplibre-gl-js/docs/API/classes/GeolocateControl/

Semantics:

• By default does not do anything
• When the user requests location tracking, the browser wake lock is enabled
• When the user stops location tracking, the browser wake lock is disabled
• When the user is using location tracking, but moves the map, the wake lock is disabled until the user re-enables full location tracking