Introduce CTS for VendorVibrationSession

Introduce tests for starting and ending a vendor vibration session,
validating the asynchronous behaviour and callbacks.

Bug: 345414356
Test: VendorVibrationSessionTest
Flag: android.os.vibrator.vendor_vibration_effects
Change-Id: I5669cfb65c0c6e10e3faf5f64b52d13996167892