Feat: User Check Before Entering Channel

[kenziematch]

It's checks user before granting permission to a channel, if a user doesn't belong to a channel a join button will be displayed instead on a reply box. If a user belong to a channel, no popup will show. Below are examples of when a user belong to a channel or not.

https://user-images.githubusercontent.com/81062900/137051264-5b33d177-4729-498f-a70b-62922657a65d.mp4

![Uploading user_check-2_3.gif…]()

[github-actions[bot]]

The status is success