fix(rln-relay): readPersistentRlnCredentials returns a result #1310
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Closes #1053, part of the effort to convert all errors thrown in the waku-rln-relay
protocol to results, and eventually enums
(#1245).
readPersistentRlnCredentials
could raise OSErrors, IOErrors and Exceptions, and nowreturns an RlnRelayResult.