Implement rationale activity for data access

On Android 12 and up apps can include a `DataAccessRationaleActivity` Activity which can be opened from the system's Permission Dashboard or from the app's settings.
This activity should show an UI that explains to users why the app makes certain data accesses.
This is a nice to have privacy wise. We could use it to explain why we are getting some user data from the system and when.

https://developer.android.com/training/permissions/explaining-access#privacy-dashboard-show-rationale