[feature]: Support at someone in the discription/comment

[klion26]

Is there an existing issue for this?

• I have searched the existing issues

Summary

Want to support at someone in the issue description/comment, and the one who has been at could receive some notification.

Why should this be worked on?

This can be helpful if some issue need the other to pay attention to.

[rhea0110]

Hey @klion26, we sincerely appreciate and value your suggestion. Thank you for submitting the feature request. Our team will brainstorm around it, and we will keep you updated on any progress made.

Thanks!

[Palanikannan1437]

Hey @klion26, we've delivered this! Here's a PR from my pal @henit-chobisa here at #2544. Please consider upgrading to the latest version to try it out!!