Local cell tower database location backend

Is your feature request related to a problem? Please describe.
Current solutions are not very useful in any new areas or when the current local backend remembers cell tower positions incorrectly.

Describe the solution you'd like
Basically what this project does: https://gitlab.com/deveee/Local-GSM-Backend
It just downloads cell tower databases from OpenCellID and Mozilla and merges them into a single database.

Describe alternatives you've considered
There's no alternative available at the moment

Additional context
In terms of licensing, Mozilla dataset is public domain, and OpenCellID is CC-BY-SA-4.0, though it requires an API key. Local GSM Backend also included lacells as a source, which is just a script that merges data from those two sources, plus radiocells.org (which seems to be dead now). Reuploading the database somewhere to avoid the API key requirement should be fine. Also lacells allows for downloading country specific datasets.

Start by reviewing how GmsCore currently handles local cell-tower location data, then compare the proposed Local GSM Backend flow with the OpenCellID and Mozilla datasets. Identify where country-specific downloads, merging, licensing, and API-key handling would belong. No GmsCore file or test is named, so the first code entry point and completion checks must be established.