static AccessPredicate authenticated() {
        return (a, c) -> true;
    }
All authenticated users can access the protected instance including anonymous users.

<p>
<b>Note:</b> The negation of this call is {@link #denyAll()} and NOT all unauthenticated.
</p>

@return A newly created AccessPredicate that always returns true.
grpc-server-spring-boot-starter/src/main/java/net/devh/boot/grpc/server/security/check/AccessPredicate.java