[Feature Request] - Support for https client certificates

[Steven--]

Summary

It would be nice if Tempo supported client-side HTTPS certificates.

Description

Client side certificate offer an extra layer of protection in addition to password authentication and could prevent malicious actors for exploiting vulnerabilities in internet-facing subsonic servers.
Android allows for both custom CA certificate and client certificates to be added to the system trust store, however they seem to be ignored by Tempo and the connection fails.

Use Case

Currently anyone that hosts a subsonic server behind HTTPS client authentication is prevented from using Tempo. The proposed feature would allow these users to enjoy Tempo as well.

Additional context

See also daneren2005/Subsonic#931 for a similar issue related to another Subsonic client.