Use Hikari Connection Pool for handling Clickhouse connections #909

Job	Run time
build-kafka-lightweight / build	2m 58s
java-tests-kafka / java-kafka	17m 11s
java-tests-lightweight / java-lightweight	1h 11m 37s
testflows-lightweight / testflows-lightweight	5h 14m 11s
testflows-kafka / testflows-kafka	3h 20m 34s
testflows-lightweight / testflows-lightweight-replicated	5h 8m 46s
	15h 15m 17s

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