Feat: ConnectionService implementation (equivalent to iOS CallKit) [preview]

[cybex-dev]

This extends (expected) functionality found in iOS to Android, providing native Phone integration for Twilio.

Note - this is early preview at the moment.

Features include:

• [x] Place outgoing calls via Telecom app
• [x] Accept/Reject incoming calls via Telecom app
• [x] DTMF event feedback
• [x] Change/select audio device output via Flutter (in addition to native audio device selection)
• [x] Un/Hold calls
• [x] Un/Mute
• [x] Resolving call parameters:
  • [x] Call subject _TWI_SUBJECT
  • [x] Caller / Callee Human-readable Names, ID & avatar URLs (showing up as incoming call contacts replacing registerClient)

Features deferred

• Create contacts as replacement for registerClients (see above) This will be integrated into a separated feature across platforms

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