feat: respect guild boost file size limit when re-sending attachments

Myriad/Extensions/GuildExtensions.cs

@@ -1,7 +1,22 @@
+using Myriad.Types;
+
 namespace Myriad.Extensions
 {
     public static class GuildExtensions
     {
-
+        public static int FileSizeLimit(this Guild guild)
+        {
+            switch (guild.PremiumTier)
+            {
+                default:
+                case PremiumTier.NONE:
+                case PremiumTier.TIER_1:
+                    return 8;
+                case PremiumTier.TIER_2:
+                    return 50;
+                case PremiumTier.TIER_3:
+                    return 100;
+            }
+        }
     }
 }

Myriad/Types/Guild.cs

@@ -1,5 +1,13 @@
 namespace Myriad.Types
 {
+    public enum PremiumTier
+    {
+        NONE,
+        TIER_1,
+        TIER_2,
+        TIER_3,
+    }
+
     public record Guild
     {
         public ulong Id { get; init; }
@@ -15,6 +23,7 @@ namespace Myriad.Types
         public bool? WidgetEnabled { get; init; }
         public ulong? WidgetChannelId { get; init; }
         public int VerificationLevel { get; init; }
+        public PremiumTier PremiumTier { get; init; }
 
         public Role[] Roles { get; init; }
         public string[] Features { get; init; }