Add Networking Options for Google Push Notifications

It has recently come to light that governments use Google Push Notifications to surveil users. Given privacy focused like Calyx OS, this could be a problem for some users. Given this, I think it would be useful to give the option to users to hide their IP addresses.

A new firebase setting page could allow custom networking settings. There, a user could input a HTTPS proxy server to be inputted. All push notifications are received through an HTTPS proxy. This could reduce the information sent to Google, and make it harder for Governments to identify one person from another. Unlike TOR or VPNs, there is no difficult protocols to implement or concerns about breaking Android;s security model.The battery impact would be negligible. Although there may be a small half a second delay before a push notification will come in. But unlike TOR or VPNs, a network operator could detect the presence of a proxy and infer some information about the request. This could be mitigated with Private DNS but not completely. Another issue is if the proxy is down there needs to be some way of communicating that to the user.

No files, tests, or entry points are mentioned. Start by mapping the Firebase push-notification implementation and existing settings pages, then determine the scope for HTTPS proxy configuration, failure reporting, and notification routing before defining completion criteria.