Add debug interface to WorkboxPlugins

A new interface, HasDebugInterface, has been implemented in various WorkboxPlugins allowing for improved debugging capabilities. Additionally, a new Twig InstanceOfExtension has been added to distinguish plugins implementing the aforementioned interface and permitting pretty-printed json display in the debug view.

templates/Collector/serviceworker-tab.html.twig

@@ -140,7 +140,7 @@
                 <span class="badge">{{ cachingStrategy.matchCallback }}</span><br>
                 {{ cachingStrategy.getMethod() ?? "GET" }}
             </td>
-            <td class="break-long-words">
+            <td class="break-long-words font-normal">
                 {% if cachingStrategy.plugins|length == 0 %}
                     None
                 {% else %}