feat(panel): allow transform to be animated on elements with an offset

[crisbeto]

If a panel has an offset (position.withOffsetX or position.withOffsetY), then it's transform can't be animated, because it uses inline transforms to do the offsetting. I'm considering applying the animations to an inner container, that has nothing to do with the panel positioning.

This issue is blocking for #9641.

CC @ErinCoughlan @bradrich @DerekLouie