Introducing WaveformEnvelopeBuilder to VibrationEffect

We’re introducing a new parcelable PwleSegment and VibrationEffect.startWaveformEnvelope() method which returns a WaveformEnvelopeBuilder allowing the creation of PWLE effects with varying amplitudes and frequencies.

Bug: 347035826
Flag: android.os.vibrator.normalized_pwle_effects
Test: atest FrameworksVibratorCoreTests
Change-Id: Ia9105c25897152b3262ef735b7dd40009a72bda8