Show ratio of people who have read the message compared to total people in channel

Description:

Rocket.Chat uses ticks to indicate the read receipts for the user. It is possible to see the list of people who have read the message from the "Info" popup, where the members are listed. To keep track of all people in the room who have read the messages, it would help to see an ratio of people who have read the message out of the total people in the room. It will help the room administrator / moderator to see in glance, if everyone are up to speed.

For example, if the room had 20 people in total and only 5 have read the last message, then the read receipt would show 5 / 20 (or 25% etc). This would be shown per message.

Steps to reproduce:

1. view the message read receipt

Expected behavior:

Have an information how many people in the room have read your message in a glance.

Actual behavior:

Not shown.

Server Setup Information:

• Version of Rocket.Chat Server: 3.1.1
• Operating System: Linux
• Deployment Method: docker
• Number of Running Instances: 1
• DB Replicaset Oplog: disabled
• NodeJS Version: 12.18.4
• MongoDB Version: 4.0.17

Client Setup Information

• Desktop App or Browser Version: Desktop app 3.1.1
• Operating System: Linux

Additional context

Same in the web app and desktop app.

Relevant logs:

NA

Start at the message read receipt and its "Info" popup in the web and desktop apps, then trace how the reader list and total channel membership are obtained. Done means each message's read-receipt view shows the number or percentage of readers relative to the total people in the room.