Add LangGraph workflow streams sample #1295

Job	Run time
build-lint-test (3.10, windows-latest)	8m 37s
build-lint-test (3.14, windows-latest)	8m 6s
build-lint-test (3.10, ubuntu-latest)	7m 4s
build-lint-test (3.10, macos-intel)	13m 14s
build-lint-test (3.14, ubuntu-latest)	7m 12s
build-lint-test (3.14, macos-intel)	9m 44s
build-lint-test (3.14, macos-arm)	6m 44s
build-lint-test (3.10, macos-arm)	8m 36s
	1h 9m 17s

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