Add support for User-Installed Apps

[2br-2b]

Summary

Add support for User-Installed Apps

What is the feature request for?

The core library

The Problem

Per their announcement earlier today, Discord is betaing user-installable apps:

This allows users to install an app to their profile and access its commands in any server or in a dm, even if the bot isn't installed in the server

The Ideal Solution

Add the necessary fields and decorators for these fields. If I have time later, I can write up a draft

https://discord.com/channels/613425648685547541/697138785317814292/1219333034701226044

The Current Solution

No response

Additional Context

This is still in beta, so it is subject to change

[AbstractUmbra]

Please see #9406.

[2br-2b]

Now #9760. Should I leave this issue open to track the feature's progress or close it as redundant/wip/planned?

Also, thanks to the dpy contributors for the quick turnaround!