Add unknown type support in visualiser

Summary:
^

In this case, the unknown value, which is a text will be displayed as sent by the client.

Reviewed By: antonk52

Differential Revision: D41494094

fbshipit-source-id: 9295e3f7e055a8ce9b430137600108a4cdf32c90

desktop/plugins/public/ui-debugger/components/sidebar/inspector/AttributesInspector.tsx

@@ -153,6 +153,12 @@ function create(
           <SpaceBoxInspector value={inspectable.value} />
         </NamedAttributeInspector>
       );
+    case 'unknown':
+      return (
+        <NamedAttributeInspector name={displayableName(name)}>
+          <TextValue>{inspectable.value}</TextValue>
+        </NamedAttributeInspector>
+      );
     case 'object':
       return (
         <ObjectAttributeInspector