Add mouse scrollling speed slide bar

Bug: 383555305
Bug: 84795606
Test: Local DUT with aconfig flags enabled, verified slide bar
      appears and can be updated.
      Verified adjusting slide bar affects scrolling speed.
Flag: com.android.hardware.input.mouse_scrolling_acceleration
Change-Id: Ia66f88ce855ab152a161ef3f81ab643415fad517