fix: don't try to re-send stickers and activity invites

Myriad/Types/Sticker.cs

@@ -0,0 +1,29 @@
+namespace Myriad.Types;
+
+public record Sticker
+{
+    public enum StickerType
+    {
+        STANDARD = 1,
+        GUILD = 2,
+    }
+
+    public enum StickerFormatType
+    {
+        PNG = 1,
+        APNG = 2,
+        LOTTIE = 3,
+    }
+
+    public ulong Id { get; init; }
+    public StickerType Type { get; init; }
+    public ulong? PackId { get; init; }
+    public string Name { get; init; }
+    public string? Description { get; init; }
+    public string Tags { get; init; }
+    public string Asset { get; init; }
+    public bool Available { get; init; }
+    public ulong? GuildId { get; init; }
+    public User? User { get; init; }
+    public int? SortValue { get; init; }
+}