AICS: Audio input control point expose up to aidl

This control point is related to:
* GainSetting
* Mute
* GainMode

For each of this characteristics, implement the setter and getter as per
the aics spec and provide callback in case of error.

Bug: 372328699
Flag: com.android.bluetooth.flags.aics_api
Test: atest CtsBluetoothTestCases
Change-Id: Ia8d497dbfe8ffbb3c2c2f3a75b3baba827188218