refacor: improve cache interface (#3492)

* fix: proper typehint on setScope

* refactor: type hint setKey()

* typehint

actions/SetBridgeCacheAction.php

@@ -39,6 +39,10 @@ class SetBridgeCacheAction implements ActionInterface
 
         $cache = $cacheFactory->create();
         $cache->setScope(get_class($bridge));
+        if (!is_array($key)) {
+            // not sure if $key is an array when it comes in from request
+            $key = [$key];
+        }
         $cache->setKey($key);
         $cache->saveData($value);