default @NonNull CompletableFuture<User> loadUser(@NonNull UUID uniqueId) {
        return loadUser(uniqueId, null);
    }
Loads a user from the plugin's storage provider into memory.

@param uniqueId the uuid of the user
@return the resultant user
@throws NullPointerException if the uuid is null
api/src/main/java/net/luckperms/api/model/user/UserManager.java