Add Workflow Streams library #4973

Job	Run time
test-latest-deps	9m 50s
cloud-test	1m 44s
build-lint-test (3.14, ubuntu-arm)	10m 17s
build-lint-test (3.10, ubuntu-latest)	13m 45s
check-protos	7m 42s
build-lint-test (3.14, ubuntu-latest)	16m 24s
features-tests / test	8m 6s
build-lint-test (3.10, windows-latest)	18m 6s
build-lint-test (3.10, macos-intel)	17m 43s
build-lint-test (3.10, macos-arm)	7m 40s
build-lint-test (3.10, ubuntu-arm)	10m 45s
build-lint-test (3.14, macos-arm)	7m 11s
build-lint-test (3.14, macos-intel)	15m 57s
build-lint-test (3.14, windows-latest)	18m 47s
	2h 43m 57s

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