change(zebra-scan): Scan only one key per backend call #442

Job	Run time
Build CI Docker / Build images	11m 22s
Build CI Docker / Build images	11m 22s
Test with fake activation heights	8m 5s
Test with fake activation heights	8m 5s
Test all	7m 52s
Test all	7m 52s
Test checkpoint sync from empty state	11m 2s
Test checkpoint sync from empty state	11m 2s
Test integration with lightwalletd	11m 13s
Test integration with lightwalletd	10m 59s
Test CI default Docker config file / Test default-conf in Docker	2m 24s
Test CI default Docker config file / Test default-conf in Docker	2m 24s
Test CI testnet Docker config file / Test testnet-conf in Docker	2m 22s
Test CI testnet Docker config file / Test testnet-conf in Docker	2m 22s
Test CI custom Docker config file / Test custom-conf in Docker	1m 24s
Test CI custom Docker config file / Test custom-conf in Docker	1m 24s
Open or update issues for main branch failures	0s
Open or update issues for main branch failures	0s
	1h 51m 14s

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