fix: Add a fallback metadata provider which pulls metadata from WADO-… (#1158)

* fix: Add a fallback metadata provider which pulls metadata from WADO-RS cache when WADO-URI is used.

* cleanup

extensions/cornerstone/package.json

@@ -48,6 +48,7 @@
     "@babel/runtime": "^7.5.5",
     "classnames": "^2.2.6",
     "lodash.throttle": "^4.1.1",
+    "query-string": "^6.8.3",
     "react-cornerstone-viewport": "2.x.x"
   }
 }