Added settings UI for camera lift trigger gesture

Bug: 37154489
Test: manual + make RunSettingsRoboTests

- Added preference fragment for camera lift gesture
- Added activity alias for camera lift gesture setting
- Added resources + overlays for camera lift gesture setting
- Added config flag for limiting camera lift gesture setting for Pixel
- Added Robolectric tests for camera lift gesture settings classes

Change-Id: Ie4846cb1ea6b5279a19f20cb0299426f0d5cbb71