This PR would reduce the API calls if there are more than 100 total
conversations, we will throttle requests the number of requests.
Earlier this was 1000 total conversations.
For large accounts with huge volumes of messages, it can be very
wasteful to make the meta request so often. It also puts un-necessary
load on the DB bombarding it with so many requests. This PR fixes it by
throttling the requests to 5 seconds for all users with more than 1000
accessible chats.
### Why not cache this value in the backend?
Well, it's a bit tricky, since a user can have different permissions
over inboxes and can see different chats, maintaining a cache for each
of them is not effective, besides the requests will reach the server
anyway.
