Add a logging network option

[kevinboulain]

We currently have two ways to enable logging:

• globally, with (enable-lui-logging-globally)
• per buffer, with M-x enable-lui-logging

I believe we can make that a little easier and have an option in circe-network-option to enable logging for a server:

(setq circe-network-options '(
  ("Libera Chat"
   ;; ...
   :logging t)))

Most of the time I want to enable or disable logging for a whole server. I guess if people want to have more granular options, we can easily support a list of channels there too.

If this gets merged, I'll update https://github.com/jorgenschaefer/circe/wiki/Configuration#logging

[wasamasa]

This looks like a good idea overall.

[wasamasa]

Thanks again!