Added Bot propety for easy access to the ISelfUser to all medusa *Context types

src/NadekoBot/Common/Medusa/Adapters/DmContextAdapter.cs

@@ -5,9 +5,11 @@ public sealed class DmContextAdapter : DmContext
     public override IMedusaStrings Strings { get; }
     public override IDMChannel Channel { get; }
     public override IUserMessage Message { get; }
+    public override ISelfUser Bot { get; }
     public override IUser User
         => Message.Author;
     
+    
     private readonly IServiceProvider _services;
     private readonly Lazy<IEmbedBuilderService> _ebs;
     private readonly Lazy<IBotStrings> _botStrings;
@@ -26,6 +28,7 @@ public sealed class DmContextAdapter : DmContext
 
         Channel = ch;
         Message = ctx.Message;
+        Bot = ctx.Client.CurrentUser;
         
         
         _ebs = new(_services.GetRequiredService<IEmbedBuilderService>());