Add BLE Tracking

[s-yanev]

Is your feature request related to a problem? Please describe.
The application should be able to track different devices that I had contact with via Bluetooth in close proximity.

Describe the solution you'd like
The application should track all of the devices in close proximity in the background and store the data on the phone or send it to the backend depending on the EU regulations.

Describe alternatives you've considered
We should consider using the new Apple/Google APIs for tracking.

[s-yanev]

Currently the task is put on hold because of the new EU regulations which are related to the user privacy.

[PeterStaev]

Better to use Apple/Google's contact tracing API. It is used by numerous EU countries (so it respects EU privacy regulations) and there is even an EU initiative for cross-border notifications between member countries that use the decentralized Google/Apple contact tracing.

[ddachkinov]

What resources are needed for it to be implemented?