CTA2075: add client loudness configuration interfaces

The client can instantiate LoudnessCodecConfigurator's which are used to
receive loudness updates as defined by CTA2075. They can subscribe to
receive asynchronous updates with the option to modify the MediaCodec
parameter so get a one time synchronous result for a given codec.

Test: adb shell device_config put media_audio android.media.audio.loudness_configurator_api true
Test: atest LoudnessCodecConfiguratorTest
Bug: 298463873
Change-Id: Id76063821211f786957ef8d7df97419f74d9ae53