Introduce VendorVibrationSession

Introduce Vibrator APIs to start vendor vibration sessions.

Vendor sessions will play vibration requests without resetting the
vibrator hardware state, allowing the vendor to customize the behaviour
between vibrations.

Vibration sessions can be ended by the client app or by the vibrator
service, allowing higher priority vibrations (e.g. ringtone, alarms) to
take control of the vibrator and play as usual.

Bug: 345414356
Test: FrameworksVibratorServicesTests
Flag: android.os.vibrator.vendor_vibration_effects
Change-Id: Id749cc240201bf398526c2416d5767a364b86cbf