RFC 8705 mutual TLS client authentication

[n2ygk]

Is your feature request related to a problem? Please describe.

DOT currently only supports basic auth for clients. A more secure approach to client authn is mutual TLS.

Describe the solution you'd like

Consider implementing RFX 8705 mutual TLS client authentication.

Describe alternatives you've considered

Additional context

The priority of this depends on how many clients would actually use it. Most clients will likely continue to use basic auth.