Add a dev clause for SQL queries automatic reload

[vollcheck]

This MR changes the query-fn component allowing for auto-reload SQL queries if application operates on :dev profile.

[yogthos]

Something like the following would be better in my opinion because it avoids a function call and a deref for the prod case. Since SQL queries can be performance sensitive, it's best to add as little overhead as possible by default.

(defn queries-dev [load-queries]
  (fn
    ([query params]
     (conman/query (load-queries) query params))
    ([conn query params & opts]
     (apply conman/query conn (load-queries) query params opts))))

(defn queries-prod [load-queries]
  (let [queries (load-queries)]
    (fn
      ([query params]
       (conman/query queries query params))
      ([conn query params & opts]
       (apply conman/query conn queries query params opts)))))

(defmethod ig/init-key :db.sql/query-fn
  [_ {:keys [conn options filename filenames env]
      :or   {options {}}}]
  (let [filenames (or filenames [filename])
        load-queries #(apply conman/bind-connection-map conn options filenames)]
    (with-meta
      (if (= env :dev)
        (queries-dev load-queries)
        (queries-prod load-queries))
      {:mtimes (mapv ig-utils/last-modified filenames)})))

[vollcheck]

Hey @yogthos, I've just fixed component to your liking