Add message editing command

Signed-off-by: Ske <voltasalt@gmail.com>

Myriad/Rest/Types/Requests/WebhookMessageEditRequest.cs

@@ -0,0 +1,15 @@
+using System.Text.Json.Serialization;
+
+using Myriad.Utils;
+
+namespace Myriad.Rest.Types.Requests
+{
+    public record WebhookMessageEditRequest
+    {
+        [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
+        public Optional<string?> Content { get; init; } 
+        
+        [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
+        public Optional<AllowedMentions> AllowedMentions { get; init; }
+    }
+}