🎉 Add namespace for performance measuring and debugging tools.

frontend/src/uxbox/util/perf.cljc

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+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+;;
+;; Copyright (c) 2015-2019 Andrey Antukh <niwi@niwi.nz>
+
+(ns uxbox.util.perf
+  "Performance and debugging tools."
+  #?(:cljs (:require-macros [uxbox.util.perf])))
+
+#?(:clj
+   (defmacro with-measure
+     [name & body]
+     `(let [start# (js/performance.now)
+            res# (do ~@body)
+            end# (js/performance.now)
+            time# (.toFixed (- end# start#) 2)]
+        (println (str "[perf|" ~name "] => " time#))
+        res#)))