Adds a permission to the specified app.
When users install your app on a site, it requests this permission.
Important: Disregard the Authentication note below. You can only call this method by authenticating with an account-level API key.
You can only call this method when authenticated as a Wix app or Wix user identity.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.