Create SessionManager in ADPF PowerAdvisor

Adds the "SessionManager" class, which tracks data associating
layers with specific sessions to create updates for the Power HAL
when frame composition occurs.

It also keeps track of which layers are currently "relevant" and
associated with at least one active session to streamline data
collection.

Flag: com.android.graphics.surfaceflinger.flags.adpf_native_session_manager
Bug: 360908317
Bug: 367803904
Test: atest libsurfaceflinger_unittest

Change-Id: Ic3a4df9b13a2acd9077c6ba2bc9bbe02088e214d