[MediaProjection] Introduce resize callback.

Notify client when the captured content is resized. This may be due to
the following, depending on which region is being captured:
* a display change, such as rotation, that triggers a different
   orientation or different bounds
* a task change, such as task bounds resize

Test: atest WmTests:ContentRecorderTests
Bug: 260083492
API-Coverage-Bug: 261566840
Change-Id: Ia64d40c869dea0f126ef60c09150366571dc212f