Add basic interactivity framework

PluralKit.Bot/Interactive/Button.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Threading.Tasks;
+
+using Myriad.Types;
+
+namespace PluralKit.Bot.Interactive
+{
+    public class Button
+    {
+        public string? Label { get; set; }
+        public ButtonStyle Style { get; set; } = ButtonStyle.Secondary;
+        public string? CustomId { get; set; }
+        public bool Disabled { get; set; }
+        public Func<InteractionContext, Task> Handler { get; init; }
+
+        public MessageComponent ToMessageComponent() => new()
+        {
+            Type = ComponentType.Button, 
+            Label = Label, 
+            Style = Style, 
+            CustomId = CustomId,
+            Disabled = Disabled
+        };
+    }
+}