Add bulk registration to AltheaDB #1557

Job	Run time
check	19s
clippy	35s
audit	11s
test	5m 21s
rustfmt	9s
cross-mips	38s
cross-aarch64	33s
cross-armv7	36s
cross-mipsel	42s
integration-test-five-nodes	13m 30s
integration-test-debts	17m 36s
integration-test-db-migration	12m 16s
integration-test-althea-payment	16m 41s
integration-test-eth-payments	14m 42s
integration-test-validate-contract	12m 26s
integration-test-multi-exit	13m 35s
	1h 49m 50s

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