Split supported message into RequestMessage and ResponseMessage (#25) #67

Job	Run time
build-linux (stable)	2m 43s
build-linux (beta)	2m 40s
clippy / clippy	1m 9s
code-coverage / cov	3m 31s
verify-clean-codegen / types	40s
verify-clean-node-ids / node_ids	7s
verify-clean-supported-message / supported_message	8s
verify-code-formatting / fmt	6s
	11m 4s

Provide feedback