Introduce `AbstractAsyncSelector` #11983

Job	Run time
lint	11m 52s
site	9m 27s
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	20m 28s
flaky-tests	15m 55s
build-macos-latest-jdk-21	1h 1m 22s
build-windows-latest-jdk-21	1h 9m 38s
build-ubicloud-standard-16-jdk-8	14m 5s
build-ubicloud-standard-16-jdk-11	15m 32s
build-ubicloud-standard-16-jdk-17-leak	16m 44s
build-ubicloud-standard-16-jdk-17-min-java-11	17m 19s
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	19m 8s
	4h 31m 30s

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