Introduce VibrationEffectSegment

Create a new parcelable VibrationEffectSegment in the new package
android.os.vibrator, together with three concrete implementations for
the segment types: step, prebaked and primitive.

Remove all implementations of VibrationEffect to allow composition of
any effects, represented now by the concrete type VibrationEffect that
holds a list of segments.

Bug: 167947076
Test: VibrationEffectTest
Change-Id: I79c99e29f436ed77558af764f55633bb4636e034