Disable one-to-one conversations

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Sometimes it might be desired to prevent users from creating one-to-one conversations so all channels are created by a managers/leads/teacher.

We have an option for group/public room creation to limit it to users of a given list of groups.
I guess for one-to-one a bool config is more suitable because otherwise the conditioning whether to show the profile/contacts option etc will require loading too many details from the database?

Also it comes with more workload along the way:

• Adjust profile actions
• Adjust contacts menu action
• Reply privately option needs to be removed
• Toggling the setting does not delete existing conversations
• Clients need to understand this setting too, partially automatic by the profile field restriction, but reply-privately is necessary?

Start by reviewing the existing restrictions for group and public room creation, then trace the profile actions, contacts menu action, and private-reply option mentioned in the checklist. Done means a setting prevents new one-to-one conversations, leaves existing conversations intact, and is understood by clients.