Jake

Add setting for cookie name prefix to plugin settings

5

### Checklist - [X] I have looked into the [Readme](https://github.com/auth0/wordpress#readme) and the [documentation](https://auth0.com/docs/customize/integrations/cms/wordpress-plugin), and have not found a suitable solution or answer. - [X] I have searched the [issues](https://github.com/auth0/wordpress/issues) and...