swapserverrpc: add multi-address proofs #3452

Job	Run time
Commit Message	8s
run unit-test sqlite3 race	9m 45s
run unit-test postgres race	11m 50s
SQL compilation check	9s
RPC compilation check	2m 5s
verify that auto-generated documentation is up-to-date	2m 14s
run LiT itests	13m 48s
build and lint code	5m 37s
run LiT unit tests	4m 53s
go mod check	4m 59s
	55m 28s

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