Improve manual gateway location positioning

[Safrone]

• I have searched the issues of this repository and believe that this is not a duplicate.

Summary

Currently to update the location of a gateway manually, you have to drag a map marker by hand along a map to where the gateway is installed if it is not installed in your current location.
There is no address lookup as you might expect from a map interface, nor is there a latitude/longitude input

re: https://forum.chirpstack.io/t/improve-manual-gateway-location-positioning/13788?u=safrone

What is the use-case?

Improve the experience for users who use the feature

Implementation description

Having a dialog box where one could input an address would be ideal (I’m guessing OpenStreetMap has an address API).
A way to input latitude/longitude would also be useful and likely very simple given that's how the location is encoded on the backend

Can you implement this by yourself and make a pull request?

I would if I felt more comfortable with go and frontend

[FulvioSpelta]

+1

[jkvarela]

+1 please