Add additional methods for getting raw messages from the stream #4522

Job	Run time
check linter (ubuntu-latest / stable)	1m 31s
test (ubuntu-latest / stable)	7m 23s
test (macos-latest / stable)	8m 6s
check docs (ubuntu-latest / stable)	1m 14s
check examples (ubuntu-latest / stable)	54s
test (windows-latest / stable)	7m 59s
check format (ubuntu-latest / nightly)	10s
check licenses (ubuntu-latest / stable)	21s
check feature flags (ubuntu-latest / stable)	8m 3s
check minimal versions of transitive dependencies (ubuntu-latest / stable)	23s
check minimal supported rust version (ubuntu-latest / msrv)	32s
check spelling (ubuntu-latest / nightly)	3m 42s
	40m 18s

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