Animate grid paddings change for edit mode transition

This change animates the change to content paddings around the
glanceable hub grid, so that edit mode transitions look smoother.

Test: visual; see recordings in bug
Bug: 419361764
Flag: com.android.systemui.hub_edit_mode_transition
Change-Id: Id32b9bc55fe044f645d72ef9a70e6dffd7436067