Create a skeleton Rust audio control HAL

This is to prove that rust audio control HAL can be built and can
run. The skeleton Rust audio control HAL will return UNKNOWN_ERROR
for all APIs.

Bug: 319474244
Flag: EXEMPT HAL interface change
Test: m android.hardware.automotive.audiocontrol-V4-rust-service

Change-Id: I64916b3eaa8410e0b137b5b34578710899f91324