audioflinger: refactor EffectModule class

Introduce a class EffecBase as a parent class of
EffectModule with default implementation for handles management,
basic properties storage and state management.

Bug: 146177259
Test: CTS: AudioEffectTest, EqualizerTest, VisualizerTest,
AudioPreProcessingTest
Test: manual test: Play Music EQ settings, Duo EAC and NS
Change-Id: Id91cef9db6b4f6be0d2e77a8b4afcbdc7234e519