Add xml serialization of vendor vibration effects

Introduce new tag <vendor-effect> to the vibration.xsd scheme.

This tag supports serialization of vendor effects by using the
PersistableBundle support to read/write to input/output streams.

Fix: 345411316
Flag: android.os.vibrator.vendor_vibration_effects
Test: atest android.os.vibrator.persistence
Change-Id: I6498aca127995d22bf29800437f4e20ede03642f