Use Hikari Connection Pool for handling Clickhouse connections #1043

Job	Run time
build-kafka-lightweight / build	2m 50s
testflows-kafka / testflows-kafka	1h 58m 5s
java-tests-kafka / java-kafka	1h 8m 57s
testflows-lightweight / testflows-lightweight	1h 57m 54s
java-tests-lightweight / java-lightweight	1h 4m 38s
testflows-lightweight / testflows-lightweight-replicated	1h 57m 37s
	8h 10m 1s

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