AudioFlinger: Extract Effect inner classes

Add new interfaces for accessing effects.

IAfEffectBase
IAfEffectModule
IAfEffectChain
IAfEffectHandle
IAfDeviceEffectProxy

Test: atest android.media.audio.cts.AudioEffectTest android.media.audio.cts.AudioPreProcessingTest android.media.audio.cts.BassBoostTest android.media.audio.cts.EnvReverbTest android.media.audio.cts.EqualizerTest android.media.audio.cts.LoudnessEnhancerTest android.media.audio.cts.PresetReverbTest android.media.audio.cts.VirtualizerTest android.media.audio.cts.VisualizerTest
Bug: 288339104
Bug: 288339921
Merged-In: Id27f9f7e9da53890f8e22ad45e174ff8eeb68b09
Change-Id: Id27f9f7e9da53890f8e22ad45e174ff8eeb68b09
(cherry picked from commit 6ac17ebf)