[Feature Request]: Add position to userPrefs.h

[rcarteraz]

Platform

NRF52, ESP32, RP2040, Linux Native

Description

We need to add the ability to set the device's position (latitude, longitude, altitude) in the userPrefs.h file. This feature would serve two important purposes:

Provide a hardcoded fallback if something happens to the device that has a manually set position (such as remotely deployed nodes).
Which also solves the issue of the complaints about not being able to set the position remotely.

[gergy008]

I'm still a bit of a git newbie - I just come across this while I was adding custom MQTT server to the userprefs.h file. If no-one else solves this issue I'll attempt my first pull request after some testing and see if I can resolve this