Add additional APIs in Call for Bluetooth

Add additional APIs in android.telecom.Call for consumption by Bluetooth
as they move to using an InCallService.

Also refactor ParcelableCall to use a builder pattern

Fixes: 147445725
Fixes: 147445603
Test: atest CallDetailsTest ConferenceTest
Change-Id: I12241b4ceadaa840f6e577bcfa8521375aedcb6a