Implement add meeting point flow

[aniri]

Implement the add meeting point flow in onboarding.

This flow is very similar to the one for addresses. Please reuse as much as possible from #13

The addresses should also be stored locally after the success response from the backend.

In case there is no internet connection when the user tries to save the address, an error should be displayed ( depends on #8 )

Please define related colors and text & button styles in the corresponding values files.

Some basic scaffolding was added, but it needs to be cleaned up.

Map provider: here maps
to be added: save meeting point endpoint

Link to design in Figma

[toaderandrei]

Since it is related to the map, I will take care of it.

[aniri]

This should be integrated as seamlessly as possible in the existing address related fragments. Most of the code and screen should be reused.