Create API to Compute Vibration Pattern Equivalent to a VibrationEffect

This is initially thought of in
go/vibration-effects-for-notifications-dd, and can be used whenever a
vibration pattern is needed to be extracted from a VibrationEffect. See
also: go/vibration-changes-for-notification-channels

Bug: 241732519
Test: unit tests
Change-Id: Ieccbe95d40e638dec23014cc18ba11c0b5754fd8