stream: add stream/iter to classic stream adapters #5107

Job	Run time
Build slim tarball	2m 14s
x86_64-linux: with shared libraries	26m 43s
aarch64-linux: with shared libraries	21m 0s
aarch64-darwin: with shared libraries	22m 33s
x86_64-darwin: with shared libraries	40m 31s
	1h 53m 1s

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