feat: support message based proposals #4280

Job	Run time
build (amd64, gcc)	44s
build (arm64, aarch64-linux-gnu-gcc, g++-aarch64-linux-gnu)	1m 26s
install-tparse	10s
test-cosmovisor	2m 36s
cleanup-runs	8s
split-test-files	11s
tests (00)	3m 49s
tests (01)	4m 59s
test-race (00)	3m 46s
tests (02)	4m 59s
test-race (01)	3m 11s
tests (03)	3m 37s
test-race (02)	1m 59s
test-race (03)	2m 18s
upload-coverage-report	22s
	34m 15s

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