Javascript 2021 - Web component metric fix (#231)

* capture number ajax requests

* add custom metrics to Javascript topic

* update metrics for webcomponents, shadow DOM, request protocols

* addadd memory, content type metric

* script tag properties

* noscript tags

* refactor

* wcustom_element metric exits in has_shadow_root

* add webcomponent_spec metric

add charset,language

Co-authored-by: Pankaj Parkar <[email protected]>

* add async_and_defer, defer_without_src

* add inline script metric

* change attributes to hasAttribute

* fix web_component metric

Co-authored-by: Max Ostapenko <[email protected]>
Co-authored-by: Pankaj Parkar <[email protected]>

custom_metrics/javascript.js

@@ -57,7 +57,7 @@ return JSON.stringify({
             'template': template.map(getNodeName)
         }
         return web_component_specs
-    }),
+    })(),
 
     script_tags: (() => {
         let script_tags = Array.from(document.querySelectorAll('script'));