[FLINK-36944][Example] Introduce async state version of wordcount #307

Job	Run time
Pre-compile Checks / Basic QA	5m 43s
Default (Java 11) / Compile	8m 59s
Default (Java 11) / Test packaging/licensing	33m 19s
Default (Java 11) / E2E (group 1)	1h 25m 8s
Default (Java 11) / E2E (group 2)	1h 46m 28s
Default (Java 11) / Test (module: core)	31m 10s
Default (Java 11) / Test (module: python)	29m 54s
Default (Java 11) / Test (module: table)	34m 30s
Default (Java 11) / Test (module: connect)	21m 5s
Default (Java 11) / Test (module: tests)	38m 47s
Default (Java 11) / Test (module: misc)	27m 52s
	7h 2m 55s

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