[FLINK-36944][Example] Introduce async state version of wordcount #303

Job	Run time
Pre-compile Checks / Basic QA	10m 1s
Default (Java 11) / Compile	9m 2s
Default (Java 11) / E2E (group 1)	1h 28m 37s
Default (Java 11) / Test packaging/licensing	35m 37s
Default (Java 11) / Test (module: core)	29m 40s
Default (Java 11) / Test (module: python)	28m 46s
Default (Java 11) / E2E (group 2)	5h 10m 14s
Default (Java 11) / Test (module: table)	38m 57s
Default (Java 11) / Test (module: connect)	24m 38s
Default (Java 11) / Test (module: tests)	37m 57s
Default (Java 11) / Test (module: misc)	27m 51s
	10h 41m 20s

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