feat: support message based proposals (backport #1372) #4287

Job	Run time
build (amd64, gcc)	33s
install-tparse	15s
build (arm64, aarch64-linux-gnu-gcc, g++-aarch64-linux-gnu)	1m 20s
cleanup-runs	8s
split-test-files	13s
test-cosmovisor	2m 46s
test-race (00)	3m 57s
tests (00)	4m 4s
test-race (01)	3m 16s
test-race (02)	2m 7s
tests (01)	4m 44s
test-race (03)	2m 13s
tests (02)	4m 57s
tests (03)	3m 32s
upload-coverage-report	28s
	34m 33s

Provide feedback