Add Workflow Streams library #4963

Job	Run time
cloud-test	1m 46s
test-latest-deps	10m 4s
check-protos	8m 7s
features-tests / test	7m 51s
build-lint-test (3.10, macos-intel)	16m 19s
build-lint-test (3.10, windows-latest)	18m 41s
build-lint-test (3.14, ubuntu-arm)	12m 18s
build-lint-test (3.14, macos-intel)	18m 26s
build-lint-test (3.10, ubuntu-arm)	10m 49s
build-lint-test (3.14, ubuntu-latest)	15m 56s
build-lint-test (3.14, windows-latest)	16m 59s
build-lint-test (3.10, macos-arm)	9m 45s
build-lint-test (3.14, macos-arm)	9m 0s
build-lint-test (3.10, ubuntu-latest)	14m 18s
	2h 50m 19s

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