Introduce media and alarm vibration intensity settings

Introduce new setting keys for media and alarm vibration intensity.

Merge all default vibration intensity getters into a helper class that
receives the VibrationAttributes usage int and applies the default logic
to all usages.

Also update the usage of boolean settings for haptic feedback and ringtone
to disable vibrations in VibrationSettings.

Bug: 198346559
Bug: 207477604
Test: VibratorTest & VibrationSettingsTest
Change-Id: I69ba05a8bc35657637b1f351f4c19d2d96efc9e3