Jabber Search : XEP-0055 support

Hello,

Luke Marlin (Delzur) suggested that I create an issue to discuss Poezio's support for Jabber Search (XEP-0055).

Unlike other graphical clients like Pidgin, Poezio does not offer a way to search for a person or to have a autocompletion of a jid that is not in his roster. Graphics clients all implement the Jabber Search feature (XEP-0055): https://xmpp.org/extensions/xep-0055.html

Until now, the alternative solution adopted is to pre-fill the roster of all the accounts. However, following the growth of the company, this solution reaches its limits. It is expected in the very near future to stop this alternative solution. We are encouraged to use the search features available on many graphical clients. Unfortunately, Poezio does not allow it yet ...

I had the idea to quickly create a plugin to overcome this problem, but perhaps it would be more advisable to make Poezio support the XEP-0055?