Allow widgets to be resized on glanceable hub

Adds resize frame around the widget content of the hub in edit mode,
and implements resize logic in ContentListState

Bug: 368056517
Test: manually on device by expanding and shrinking widgets
Flag: com.android.systemui.communal_widget_resizing
Change-Id: I3ecba4418fa726dc438134db87cfd2dea0b1041f