[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>

src/Discord.Net.WebSocket/Entities/Messages/SocketUserMessage.cs

@@ -49,6 +49,9 @@ namespace Discord.WebSocket
         /// <inheritdoc />
         public IUserMessage ReferencedMessage => _referencedMessage;
 
+        /// <inheritdoc />
+        public IMessageInteractionMetadata InteractionMetadata { get; internal set; }
+
         /// <inheritdoc />
         public MessageResolvedData ResolvedData { get; internal set; }
 
@@ -203,6 +206,9 @@ namespace Discord.WebSocket
 
                 ResolvedData = new MessageResolvedData(users, members, roles, channels);
             }
+
+            if (model.InteractionMetadata.IsSpecified)
+                InteractionMetadata = model.InteractionMetadata.Value.ToInteractionMetadata();
         }
 
         /// <inheritdoc />