Added caching WAI middleware for WAI 3

I've tested locally using lts-3.16

build-constraints.yaml

@@ -675,6 +675,10 @@ packages:
     "Yann Esposito <yann.esposito@gmail.com>":
         - human-readable-duration
         - holy-project
+        - wai-middleware-caching
+        - wai-middleware-caching-lru
+        - wai-middleware-caching-redis
+        # not package maintainer
         - ekg
         - ekg-json