Use Hikari Connection Pool for handling Clickhouse connections #1121

Job	Run time
build-kafka-lightweight / build	2m 48s
testflows-kafka / testflows-kafka	18m 57s
java-tests-lightweight / java-lightweight	18m 56s
testflows-lightweight / testflows-lightweight	18m 55s
java-tests-kafka / java-kafka	21m 26s
testflows-lightweight / testflows-lightweight-replicated	17m 45s
	1h 38m 47s

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