Add Google ADK chatbot sample #1308

Job	Run time
build-lint-test (3.10, ubuntu-latest)	6m 46s
build-lint-test (3.14, ubuntu-latest)	7m 29s
build-lint-test (3.14, windows-latest)	8m 22s
build-lint-test (3.10, macos-intel)	8m 58s
build-lint-test (3.10, windows-latest)	8m 2s
build-lint-test (3.10, macos-arm)	9m 21s
build-lint-test (3.14, macos-intel)	9m 28s
build-lint-test (3.14, macos-arm)	7m 24s
	1h 5m 50s

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