refactor: add datetime to chat and subscriptions tables #173

Job	Run time
test (subscriptions_holder)	2m 15s
test (subscriptions_holder)	2m 15s
test (t_coubs_initiator)	1m 27s
test (t_coubs_initiator)	1m 27s
test (coub_smart_searcher)	1m 10s
test (coub_smart_searcher)	1m 10s
test (kafka_message_producer)	1m 55s
test (kafka_message_producer)	1m 55s
test (kafka_message_consumer)	1m 58s
test (kafka_message_consumer)	1m 58s
test (telegram_bot)	1m 49s
test (telegram_bot)	1m 49s
build (coub_smart_searcher)	36s
build (coub_smart_searcher)	6m 41s
build (kafka_message_consumer)	37s
build (kafka_message_consumer)	6m 42s
build (kafka_message_producer)	37s
build (kafka_message_producer)	6m 41s
build (spring_eureka_registry)	37s
build (spring_eureka_registry)	6m 42s
build (spring_gateway)	25s
build (spring_gateway)	6m 42s
build (subscriptions_holder)	35s
build (subscriptions_holder)	6m 42s
build (t_coubs_initiator)	19s
build (t_coubs_initiator)	6m 41s
build (coub_forwarder_telegram_bot)	38s
build (coub_forwarder_telegram_bot)	6m 41s
	1h 19m 4s

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