Add Workflow Streams library #4978

Job	Run time
test-latest-deps	9m 39s
check-protos	8m 13s
cloud-test	1m 48s
build-lint-test (3.10, ubuntu-arm)	10m 29s
features-tests / test	7m 53s
build-lint-test (3.14, macos-arm)	12m 6s
build-lint-test (3.10, windows-latest)	17m 37s
build-lint-test (3.14, ubuntu-arm)	10m 14s
build-lint-test (3.10, macos-intel)	1m 17s
build-lint-test (3.10, macos-arm)	9m 19s
build-lint-test (3.14, macos-intel)	18m 36s
build-lint-test (3.14, windows-latest)	18m 23s
build-lint-test (3.10, ubuntu-latest)	12m 38s
build-lint-test (3.14, ubuntu-latest)	16m 37s
	2h 34m 49s

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