Add bulk registration to AltheaDB #1564

Job	Run time
check	26s
clippy	27s
rustfmt	4s
audit	17s
test	9m 9s
cross-armv7	43s
cross-aarch64	39s
cross-mipsel	32s
cross-mips	2m 31s
integration-test-five-nodes	13m 0s
integration-test-multi-exit	13m 16s
integration-test-debts	17m 37s
integration-test-db-migration	12m 27s
integration-test-althea-payment	16m 45s
integration-test-eth-payments	22m 17s
integration-test-validate-contract	12m 23s
	2h 2m 33s

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