Introduce reordering functionality in media composable

This CL only reorder media when reordering is allowed. There is still an issue in the transition between QS and QQS as media carousel remembers the page in each location.

Flag: com.android.systemui.media_controls_in_compose
Bug: 397989775
Test: Checked UI.
Change-Id: I6d27539f326ac93d418980d4a85b3c2d4ddfb465