Add NPVC.mIsPanelExpanded replacement

This will allow us to remove the incorrectly named method
ShadeExpansionStateManager.addFullExpansionListener, which notifies
listeners of partial expansion of the shade or QS or if the shade is not
expanded at all but is awaiting input transfer.

Bug: 300243163
Test: added test
Test: manual
Change-Id: Iae775deab6ab57df7cc48bd4df97b40d83cedaa8