发布 `Tuple` 或 `Func` 特征

pub struct ApiBuilder<F> {
    filter: F,
}

impl<F: Filter<Error = Rejection>> ApiBuilder<F> {
    pub fn mount<N, H, Fut, R>(self, filter: N, handler: H) -> ApiBuilder<impl Filter>
    where
        F::Future: TryFuture,
        N: Filter<Error = Rejection, Extract = ()> + Clone + Send,
        N::Future: TryFuture,
        H: Fn() -> Fut + Clone + Send,
        Fut: TryFuture<Ok = R, Error = Rejection> + Send,
        R: Reply,
    {
        let action = filter.and_then(handler);
        let filter = self.filter.or(action);
        ApiBuilder { filter }
    }
}