Add Workflow Streams library #4980

Job	Run time
check-protos	8m 22s
test-latest-deps	10m 2s
cloud-test	1m 56s
features-tests / test	8m 12s
build-lint-test (3.14, ubuntu-latest)	16m 56s
build-lint-test (3.10, macos-intel)	19m 37s
build-lint-test (3.14, ubuntu-arm)	10m 18s
build-lint-test (3.14, macos-arm)	9m 4s
build-lint-test (3.10, ubuntu-latest)	13m 56s
build-lint-test (3.10, ubuntu-arm)	11m 13s
build-lint-test (3.10, macos-arm)	9m 28s
build-lint-test (3.10, windows-latest)	18m 29s
build-lint-test (3.14, macos-intel)	15m 50s
build-lint-test (3.14, windows-latest)	18m 15s
	2h 51m 38s

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