Support different contacts apps in addContact() on Android

[baltpeter]

          The docstring needs to mention that this only works if `com.android.contacts` is installed.

On my moto that I've kept stock (i.e. not installed Lineage on), that app isn't installed and trying to spawn it fails. It only has com.google.android.contacts:

❯ adb shell cmd package list packages | grep contact
package:com.google.android.contacts
package:com.motorola.contacts.preloadcontacts
package:com.google.android.syncadapters.contacts
package:com.android.providers.contacts

Originally posted by @baltpeter in #134 (comment)