public Map<Endpoint, CompletableFuture<Void>> futures() {
        return futures;
    }
Build the EndpointReadyFutures object.

@param authorizer    The authorizer to use, if any. Will be started.
@param info          Server information to be passed to the authorizer.

@return              The new futures object.
server-common/src/main/java/org/apache/kafka/server/network/EndpointReadyFutures.java