expose moveBy, replace CameraUpdateFactory#scrollBy

[tobrun]

Closes #13187, need to revisit this approach as this only allows an immediate displacement vs an animation equivalent through the CameraUpdateFactory API.

[tobrun]

@LukasPaczos I was able to fixup CamerUpdateFactory#scrollBy by inverting the padding so it can be reapplied by moveTo, easeTo and animateTo. This inversion produces not 100 percent accurate results as I the test need to use a delta for LatLng comparison (see here). The newly exposed MapboxMap#scrollBy doesn't suffer from this (it doesn't hook into moveBy, easeTo or animataTo). so I'm opting to deprecate the CameraUpdateFactory in favor of MapboxMap#scrollBy