contrib/google_adk_agents: stream LlmResponse chunks via Workflow Streams #5034

Job	Run time
cloud-test	1m 54s
check-protos	7m 4s
test-latest-deps	3m 19s
features-tests / test	8m 19s
build-lint-test (3.10, ubuntu-latest)	3m 28s
build-lint-test (3.10, ubuntu-arm)	4m 36s
build-lint-test (3.10, macos-intel)	12m 0s
build-lint-test (3.14, ubuntu-latest)	4m 44s
build-lint-test (3.10, macos-arm)	4m 8s
build-lint-test (3.10, windows-latest)	6m 31s
build-lint-test (3.14, windows-latest)	6m 52s
build-lint-test (3.14, macos-arm)	3m 55s
build-lint-test (3.14, ubuntu-arm)	4m 23s
build-lint-test (3.14, macos-intel)	12m 45s
	1h 23m 58s

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