afohrman 2468d6cae6 [Adaptive] [Side Sheets] Add SideSheetCallback listener to SideSheetBehavior to track @SheetState state change events.
Includes a fix for a really strange issue where setting the background color from the callback worked, but if setText was called, it would cause the sheet to flash off the screen when STATE_EXPANDED was reached.

PiperOrigin-RevId: 493409073
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