Many self-hosted instances require this key as a part of QA & maintenance. Since this key is not sensitive its better to send it as a part of the JSON response instead of having to use a regex to get it from the widget_script_tag
* feat: HMAC verification for web widget. Let you verify the authenticated contact via HMAC on the web widget to prevent data tampering.
* Add docs for identity-validation
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
