Java: async `getPubSubMessage`. #3159

Job	Run time
build-amazonlinux-latest (11)	15m 2s
build-amazonlinux-latest (17)	15m 3s
lint-rust	1m 1s
load-engine-matrix	3s
build-and-test-java-client (11, valkey, 7.2.5, ubuntu, ubuntu-latest, x86_64-unknown-linux-gnu)	35m 16s
build-and-test-java-client (11, valkey, 7.2.5, macos, macos-latest, aarch64-apple-darwin)	8m 19s
build-and-test-java-client (11, valkey, redis-7.0.15, ubuntu, ubuntu-latest, x86_64-unknown-linux...	35m 13s
build-and-test-java-client (11, valkey, redis-7.0.15, macos, macos-latest, aarch64-apple-darwin)	8m 53s
build-and-test-java-client (11, valkey, redis-6.2.14, ubuntu, ubuntu-latest, x86_64-unknown-linux...	35m 14s
build-and-test-java-client (11, valkey, redis-6.2.14, macos, macos-latest, aarch64-apple-darwin)	6m 58s
build-and-test-java-client (17, valkey, 7.2.5, ubuntu, ubuntu-latest, x86_64-unknown-linux-gnu)	35m 14s
build-and-test-java-client (17, valkey, 7.2.5, macos, macos-latest, aarch64-apple-darwin)	9m 43s
build-and-test-java-client (17, valkey, redis-7.0.15, ubuntu, ubuntu-latest, x86_64-unknown-linux...	35m 18s
build-and-test-java-client (17, valkey, redis-7.0.15, macos, macos-latest, aarch64-apple-darwin)	7m 55s
build-and-test-java-client (17, valkey, redis-6.2.14, ubuntu, ubuntu-latest, x86_64-unknown-linux...	35m 17s
build-and-test-java-client (17, valkey, redis-6.2.14, macos, macos-latest, aarch64-apple-darwin)	6m 46s
	4h 51m 15s

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