feat: better media types detection for JSON, XML and HTML lenses (#1438)

Co-authored-by: Andrew Bastin <andrewbastin.k@gmail.com>
Co-authored-by: Liyas Thomas <liyascthomas@gmail.com>

helpers/lenses/htmlLens.js

@@ -1,6 +1,7 @@
 const htmlLens = {
   lensName: "HTML",
-  supportedContentTypes: ["text/html"],
+  isSupportedContentType: (contentType) =>
+    /\btext\/html|application\/xhtml\+xml\b/i.test(contentType),
   renderer: "htmlres",
   rendererImport: () => import("~/components/lenses/renderers/HTMLLensRenderer"),
 }