Remove Google GMS Play Services Dependency

Dear luca App Team,

currently the application depends on the properitary GMS Services by Google.

See https://gitlab.com/lucaapp/android/-/blob/master/Luca/app/build.gradle#L66-68

It would a good idea to re-implement these stuff using Open-Source libraries.

I don't know what these libraries by Google do, or if they are required and unable to re-develope.

With an eye on F-Droid: This is is a stopper for the F-Droid Inclusion, see the policy

Regards

fossdd