MegolmBackupAuthData

fun MegolmBackupAuthData(    @Json(name = "public_key") publicKey: String,     @Json(name = "private_key_salt") privateKeySalt: String? = null,     @Json(name = "private_key_iterations") privateKeyIterations: Int? = null,     @Json(name = "signatures") signatures: Map<String, Map<String, String>>? = null)