Add additional methods for getting raw messages from the stream #4521

Job	Run time
check format (ubuntu-latest / nightly)	12s
test (ubuntu-latest / stable)	1m 1s
check examples (ubuntu-latest / stable)	48s
check docs (ubuntu-latest / stable)	59s
test (macos-latest / stable)	1m 0s
test (windows-latest / stable)	49s
check feature flags (ubuntu-latest / stable)	1m 0s
check licenses (ubuntu-latest / stable)	21s
check linter (ubuntu-latest / stable)	1m 0s
check minimal versions of transitive dependencies (ubuntu-latest / stable)	29s
check minimal supported rust version (ubuntu-latest / msrv)	38s
check spelling (ubuntu-latest / nightly)	1m 0s
	9m 17s

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