feat(core-blockchain): increase block download frequency using fastSync option #2943

Job	Run time
core (16.x)	4m 15s
core-api (16.x)	3m 39s
core-blockchain (16.x)	3m 8s
core-cli (16.x)	3m 34s
core-database (16.x)	2m 53s
core-forger (16.x)	2m 55s
core-kernel (16.x)	3m 25s
core-logger-pino (16.x)	2m 48s
core-magistrate-api (16.x)	2m 52s
core-magistrate-crypto (16.x)	2m 52s
core-magistrate-transactions (16.x)	3m 3s
core-snapshots (16.x)	3m 0s
core-p2p (16.x)	4m 39s
core-state (16.x)	3m 12s
core-test-framework (16.x)	3m 23s
core-transaction-pool (16.x)	2m 56s
core-transactions (16.x)	3m 46s
core-webhooks (16.x)	3m 10s
crypto (16.x)	3m 23s
	1h 2m 53s

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