Change Message.application type to MessageApplication

Co-authored-by: Danny <1695103+Rapptz@users.noreply.github.com>

discord/asset.py

@@ -254,6 +254,17 @@ class Asset(AssetMixin):
             animated=False,
         )
 
+    @classmethod
+    def _from_app_icon(
+        cls, state: _State, object_id: int, icon_hash: str, asset_type: Literal['icon', 'cover_image']
+    ) -> Self:
+        return cls(
+            state,
+            url=f'{cls.BASE}/app-icons/{object_id}/{asset_type}.png?size=1024',
+            key=icon_hash,
+            animated=False,
+        )
+
     @classmethod
     def _from_cover_image(cls, state: _State, object_id: int, cover_image_hash: str) -> Self:
         return cls(