SF: Introduce LayerCompositionState

This moves the remaining display-independent state from LayerBE.h to a
new LayerFECompositionState state structure.

LayerFECompositionState is also set up as a subset of a new
LayerCompositionState structure, which is owned by each
compositionengine::Layer.

The existing front-end SurfaceFlinger code is minimally adjusted to
store the state in the new structures.

Test: atest libsurfaceflinger_unittest libcompositionengine_test
Bug: 121291683
Change-Id: I20e4aa1a51b2ccbb19d5a1f0a1fad42ee9b7f41a