Feature: Support file type messages on widget and dashboard (#659)

- Adds support for file upload

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>
Co-authored-by: Sojan <sojan@pepalo.com>

app/javascript/shared/helpers/specs/MessageFormatter.spec.js

@@ -6,7 +6,7 @@ describe('#MessageFormatter', () => {
       const message =
         'Chatwoot is an opensource tool\nSee more at https://www.chatwoot.com';
       expect(new MessageFormatter(message).formattedMessage).toEqual(
-        'Chatwoot is an opensource tool<br>See more at <a href="https://www.chatwoot.com" target="_blank">https://www.chatwoot.com</a>'
+        'Chatwoot is an opensource tool<br>See more at <a rel="noreferrer noopener nofollow" href="https://www.chatwoot.com" target="_blank">https://www.chatwoot.com</a>'
       );
     });
   });