[FLINK-36944][Example] Introduce async state version of wordcount #302

Job	Run time
Pre-compile Checks / Basic QA	9m 46s
Default (Java 11) / Compile	53m 22s
Default (Java 11) / Test packaging/licensing	34m 52s
Default (Java 11) / E2E (group 1)	1h 59m 11s
Default (Java 11) / Test (module: core)	29m 29s
Default (Java 11) / E2E (group 2)	2h 5m 3s
Default (Java 11) / Test (module: python)	29m 45s
Default (Java 11) / Test (module: table)	36m 6s
Default (Java 11) / Test (module: connect)	21m 16s
Default (Java 11) / Test (module: tests)	36m 45s
Default (Java 11) / Test (module: misc)	28m 3s
	8h 43m 38s

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