[Feature] Initial user apps support (#2883)

* omg it kinda works somehow

* more things added

* a bit of xmldocs

* added interaction framework support

* working? IF

* more builder stuff

* space

* rename attribute to prevent conflict with `ContextType` enum

* context type

* moar features

* remove integration types

* trigger workflow

* modelzzzz

* `InteractionContextType`

* allow setting custom status with `SetGameAsync`

* bugzzz

* app permissions

* message interaction context

* hm

* push for cd

* structs lets goooo

* whoops forgot to change types

* whoops x2

* tweak some things

* xmldocs + missing prop + fix enabled in dm

* moar validations

* deprecate a bunch of stuffz

* disable moar obsolete warnings

* add IF sample

* Apply suggestions from code review

Co-authored-by: Quin Lynch <49576606+quinchs@users.noreply.github.com>

* Update src/Discord.Net.Rest/Entities/RestApplication.cs

Co-authored-by: Quin Lynch <49576606+quinchs@users.noreply.github.com>

---------

Co-authored-by: Quin Lynch <49576606+quinchs@users.noreply.github.com>

docs/toc.yml

@@ -1,11 +1,11 @@
 - name: Home
   href: index.md
-- name: Documentation
-  href: api/
-  topicUid: API.Docs
 - name: Guides
   href: guides/
   topicUid: Guides.Introduction
+- name: API Reference
+  href: api/
+  topicUid: API.Docs
 - name: FAQ
   href: faq/
   topicUid: FAQ.Basics.GetStarted