Force use just one Direct chat between users

### Description

Could be nice if thre is a mode where Direct chat are foreced to be done in the same Chatroom and a user can not create more than 1 Direct chat for each person.

#### Suggested tags:
priority: P4: intereseting idea - bluesky some day
bug or feature: feature
bug severity: cosmetic - feature works functionally but UI/UX is broken
additional categories:
release blocker - no
ui/ux - yes
network - none
platform - any

### Steps to reproduce

Start a new chat with a particualr users always starts the same Chatroom (if the chatroom is not previously created, this is created at first time)

Currently, you can start many Direct chat with a same person. This difficult diving into the historical looking for old conversations.