Go CI

Java: Add `FLUSHDB` command. #1064

Job	Run time
lint-rust	51s
build-and-test-go-client (1.18.10, 6.2.14, ubuntu, ubuntu-latest, x86_64-unknown-linux-gnu)	2m 35s
build-and-test-go-client (1.18.10, 6.2.14, macos, macos-latest, aarch64-apple-darwin)	6m 1s
build-amazonlinux-latest (1.18.10)	3m 34s
build-amazonlinux-latest (1.22.0)	4m 1s
build-and-test-go-client (1.18.10, 7.2.3, ubuntu, ubuntu-latest, x86_64-unknown-linux-gnu)	2m 39s
build-and-test-go-client (1.18.10, 7.2.3, macos, macos-latest, aarch64-apple-darwin)	5m 0s
build-and-test-go-client (1.22.0, 6.2.14, ubuntu, ubuntu-latest, x86_64-unknown-linux-gnu)	3m 9s
build-and-test-go-client (1.22.0, 6.2.14, macos, macos-latest, aarch64-apple-darwin)	5m 49s
build-and-test-go-client (1.22.0, 7.2.3, ubuntu, ubuntu-latest, x86_64-unknown-linux-gnu)	2m 43s
build-and-test-go-client (1.22.0, 7.2.3, macos, macos-latest, aarch64-apple-darwin)	5m 6s
	41m 28s

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