add frequent and periodic polling samples #123

Job	Run time
build-lint-test (ubuntu-latest, 3.4)	2m 5s
build-lint-test (ubuntu-latest, 3.2)	2m 17s
build-lint-test (macos-latest, 3.2)	1m 58s
build-lint-test (macos-latest, 3.4)	1m 17s
	7m 37s

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