[WIP] feat: inbuilt dialer including call history

[Bnyro]

TODO:

• a button to mute the mic and one to turn the normal speakers on for audio output
• Dual sim support
• a notification to get back to the current call
• In call dialpad
• Proximity Sensor support
• testing !!!

NOTES:

• the minSdk bump is necessary because lower Android versions don't allow to use the InCallService

[M00NJ]

Some things I noticed while doing some preliminary testing:

1. Selecting a contact from the contacts tab and clicking on dial doesn't work (nothing happens)
2. When the phone is not picked up and the call goes to the mailbox, it automatically switches to the AOSP phone app and the call is continued there (really strange)
3. There's no way to delete calls (swipe to dismiss and a 'clear all' button would make sense here)
4. The dialer screen persists after hanging up (you need to minimise or close the app to go back)

Some other things we should considers:

• Implement search in the phone tab as well
  (ATM with the dial button not working there's no way to select a contact that you haven't called recently, so you'll have to know the number and dial it.)
• Use a list instead of cards
  (I mentioned this already for the contacts tab, but it applies even more so here. If we're listing items we should use a list 😅. So many cards on screen make the UI look cramped IMO and waste vertical space, where there might fit another contact on screen.)

This is really exiting :). I'm also surprised by how good the call quality is. I hope I'll be more free in the coming weeks so I can do more testing and help with this as well...

[SuhasDissa]

I think it will be easier if we could merge this PR now and work on the other features after merging.
Integrating contacts with the dialer will probably require some refactoring, which could cause merge conflicts.

Apart from that, I believe that the dialer is stable enough to mark as an experimental opt-in feature.

[Bnyro]

I agree on that, let's merge 👍

Before creating a new release we can just make a preference to opt-in for using it.