Add additional methods for getting raw messages from the stream #4550

Job	Run time
check docs (ubuntu-latest / stable)	31s
test (ubuntu-latest / stable)	8m 14s
check format (ubuntu-latest / nightly)	10s
test (macos-latest / stable)	8m 33s
check examples (ubuntu-latest / stable)	44s
check licenses (ubuntu-latest / stable)	21s
test (windows-latest / stable)	10m 46s
check linter (ubuntu-latest / stable)	1m 5s
check minimal versions of transitive dependencies (ubuntu-latest / stable)	35s
check minimal supported rust version (ubuntu-latest / msrv)	22s
check spelling (ubuntu-latest / nightly)	3m 33s
check feature flags (ubuntu-latest / stable)	13m 19s
	48m 13s

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