More transparent middleware setup

[kkharji]

Should it be more customizable? I mean I think the ordering matter and simply appending generated middleware might not be viable. My suggestion is, perhaps the user control the list of middleware directly through duct.reitit/middleware:

Right now, here how duct.reitit creates middleware:

(defn- get-router-middleware [{:keys [muuntaja middleware] :as options}]
  (let [format-middleware     (when muuntaja format-middleware)
        exception-middleware  (exception/get-middleware options)
        coercion-middlewares  (coercion/get-middleware options)
        default-middelwares   [custom/initialize-middleware
                               custom/environment-middleware
                               parameters-middleware
                               format-middleware
                               exception-middleware]]
    (compact (vec (concat default-middelwares coercion-middlewares middleware)))))

The ordering of default-middelwares as well as the marge of coercion-middlewares should may be defined by the user like

{:duct.reitit/middleware 
 [:logger-request-middleware
  :environment-middleware 
  :parameter-middleware
  :format-middleware ; should do nothing if muuntaja isn't activated 
  :exception-middleware 
  :coerce-request-middleware ; should do nothing if coercer is nil or coercion isn't activated 
  :coerce-response-middleware ; should do nothing if coercer is nil or coercion isn't activated 
  :user-defined-middleware ;; located in `project-ns/middleware/user-defined-middleware
  user-defined-middleware  ;; symbol located in `project-ns/middleware/user-defined-middleware
]}