Add Workflow Streams library #4985

Job	Run time
test-latest-deps	10m 21s
cloud-test	1m 54s
check-protos	7m 54s
features-tests / test	7m 58s
build-lint-test (3.14, ubuntu-latest)	16m 41s
build-lint-test (3.10, macos-intel)	13m 28s
build-lint-test (3.10, windows-latest)	21m 17s
build-lint-test (3.10, macos-arm)	11m 44s
build-lint-test (3.10, ubuntu-latest)	13m 32s
build-lint-test (3.10, ubuntu-arm)	10m 48s
build-lint-test (3.14, ubuntu-arm)	10m 43s
build-lint-test (3.14, macos-arm)	9m 40s
build-lint-test (3.14, windows-latest)	17m 18s
build-lint-test (3.14, macos-intel)	17m 59s
	2h 51m 17s

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