Add LangGraph workflow streams sample #1301

Job	Run time
build-lint-test (3.10, macos-arm)	9m 40s
build-lint-test (3.14, ubuntu-latest)	7m 13s
build-lint-test (3.10, macos-intel)	10m 55s
build-lint-test (3.10, ubuntu-latest)	6m 49s
build-lint-test (3.10, windows-latest)	7m 57s
build-lint-test (3.14, windows-latest)	8m 2s
build-lint-test (3.14, macos-intel)	11m 12s
build-lint-test (3.14, macos-arm)	7m 35s
	1h 9m 23s

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