Add animation for fullscreen to desktop transition from handle menu

Adds a resize veil on top of the task and then animates the task down to
the correct size when a user transitions a task to freeform using the
handle menu.

Bug: 291759344
Test: Transition to freeform using handle menu
Change-Id: I695646f534ce1ddd4ee72c7b590b7068970e5ae4