Refactor and fix MissedCallNotifier

This change affects the behavior of the MissedCallNotifier on system
startup. Previously, MissedCallNotifierImpl created a new Call object
and used it to pull in contacts-related data. This created excessive
dependencies for MissedCallNotifierImpl, so it has been changed to use
CallerInfoLookupHelper.

Additionally, the at-boot notification has been broken for some time,
and this was due to the calls/contacts db not being ready when
TelecomSystem was initialized. This change also deferrs the missed call
lookup to when we receive ACTION_BOOT_COMPLETE.

Test: Added unit tests, tested manually on device
Change-Id: I10fe1c78e24484ece6b87fa986e725b00c753d39
Merged-In: Ibf8ec41d8d18b5ed7943a9520242f15bf546bda7
Fix: 30796667