Add bulk registration to AltheaDB #1566

Job	Run time
check	21s
check	21s
test	4m 47s
test	4m 47s
audit	8s
audit	8s
rustfmt	7s
rustfmt	7s
clippy	2m 26s
clippy	2m 26s
cross-mipsel	40s
cross-mipsel	40s
cross-aarch64	1m 37s
cross-aarch64	1m 37s
cross-armv7	44s
cross-armv7	44s
cross-mips	37s
cross-mips	37s
integration-test-five-nodes	22m 24s
integration-test-five-nodes	12m 43s
integration-test-althea-payment	0s
integration-test-althea-payment	16m 55s
integration-test-db-migration	0s
integration-test-db-migration	12m 49s
integration-test-debts	0s
integration-test-debts	17m 36s
integration-test-eth-payments	0s
integration-test-eth-payments	14m 44s
integration-test-multi-exit	0s
integration-test-multi-exit	14m 10s
integration-test-validate-contract	0s
integration-test-validate-contract	12m 44s
	2h 26m 59s

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