polish `eth_getLogs` to prevent hanging (#831) #523

Job	Run time
publish (@acala-network/eth-transactions)	2m 17s
publish (@acala-network/eth-providers)	1m 52s
publish (@acala-network/eth-rpc-adapter)	2m 3s
publish (@acala-network/bodhi)	1m 44s
	7m 56s

Provide feedback