Get Realm Web Authn Passwordless Policy
constructor(acceptableAaguids: List<String>, attestationConveyancePreference: String, authenticatorAttachment: String, avoidSameAuthenticatorRegister: Boolean, createTimeout: Int, relyingPartyEntityName: String, relyingPartyId: String, requireResidentKey: String, signatureAlgorithms: List<String>, userVerificationRequirement: String)