RFC 9266: Channel Bindings for TLS 1.3 support

[Neustradamus]

Can you add the support of RFC 9266: Channel Bindings for TLS 1.3?

• https://datatracker.ietf.org/doc/html/rfc9266

Little details, to know easily:

• tls-unique for TLS =< 1.2
• tls-exporter for TLS = 1.3

Thanks in advance.

Linked to:

• https://github.com/crossbario/autobahn-python/issues/1584