Research the setup of the torproject's xmpp support

Originally created by @muri on #11701 (Redmine)

It was brought up in a discussion about the current XMPP support channel setup, that the torproject might has some solution which could help us with setting up our XMPP support channel infrastructure.

Related issues

Is duplicate of #11307 (closed)
Blocks #11317 (closed)

Edited May 15, 2020 by muri

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