Function register

Returns Promise<
    {
        code: "Created";
        data: {
            user: {
                boxes: string[];
                email: string;
                emailIsConfirmed: boolean;
                integrations?: Record<string, unknown>;
                language: "de_DE" | "en_US";
                name: string;
                role: "user" | "admin";
                sharedBoxes?: string[];
            };
        };
        message: "Successfully registered new user";
        refreshToken: string;
        token: string;
    },
>