NewMessageService creates basic message service which serves incoming basic messages [RFC-0095] Args: name - is name of this message service (this is mandatory argument).

MessageRequestType is basic message DIDComm message type.

Message is message model for basic message protocol Reference: https://github.com/hyperledger/aries-rfcs/tree/master/features/0095-basic-message#reference.

MessageService is message service which transports incoming basic messages to handlers provided.

MessageHandle is handle function for basic message service which gets called by `basic.MessageService` to handle incoming messages.