[Task] The "Redirect" feature

[No767]

Task Description

During convos that I have with friends, oftentimes there are points where people talk over each other. So this is my solution:

When someone starts talking over someone, people can run the >redirect command, which will mention the author of the reply message and have an optional arg of the thread name. This will open up a thread, and then the bot joins the thread, and pins the message (just like what RDanny does with help posts). And then once the convo is done, we can use a command like >end-convo to close up the thread and archive them (probably lock the thread)

The app command version would be using context menus

[No767]

Finally implemented