Define new proto types for supported values API.

Define new request and result protobuf types for supported values
API. Update the proto message converter to allow converting these
APIs which will be used in GRPCVehicleHardware and
GRPCVehicleProxyServer later.

Test: atest --host VehicleHalProtoMessageConverter
Flag: EXEMPT hal
Bug: 393154530
Change-Id: I85e9a1e0516ef4d8f755ac04b6fcd6540189a666