Request/Enhancement: Add Support for HD (Hint Domain) to OauthLogin Module

[Ipstenu]

PHP version: PHP 7.4.3-4ubuntu2.28
FreeScout version: 1.8.160
Database: MySQL
Are you using CloudFlare: Yes
Are you using non-official modules: Yes

Google allows you to do a 'hint domain' that auto-prepends (and locks) the domains that can be used for oAuth. This is helpful if you have multiple domains and only want some users to log in :)

The 'fix' is editing public static function oauthGetAuthUrl and adding .'&hd=example.com

It would be extra awesome if this was a setting (since Google is one of the supported built in options).