enhancement: store blocks while crawling transactions and chain #616

Job	Run time
Tests	4m 33s
Clippy	3m 19s
Format	1m 10s
Docker (chain, chain)	7m 43s
Docker (governance, governance)	7m 42s
Validate Swagger	26s
Docker (pos, pos)	7m 25s
Docker (rewards, rewards)	7m 25s
Docker (seeder, seeder)	7m 38s
Docker (webserver, webserver)	7m 45s
Docker (parameters, parameters)	7m 26s
Docker (transactions, transactions)	7m 31s
can_enqueue	1s
can_merge	0s
	1h 10m 4s

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