SF: Move preComposition to CompositionEngine

This moves SurfaceFlinger::preComposition() to
CompositionEngine::preComposition().

As part of the move, CompositionRefreshArgs is also introduced, and to
start contains an array of outputs (not yet used), and potentially
visible layers.

Test: atest libsurfaceflinger_unittest libcompositionengine_test
Bug: 121291683
Change-Id: I0888bd6de1214381222bbae0da93bf966392b303