Add scheduler

Bot/Handler/Scheduler/ProcessMessageCommand.cs

@@ -0,0 +1,30 @@
+using Discord.WebSocket;
+using MediatR;
+
+namespace Lunaris2.Handler.Scheduler;
+
+public class ProcessMessageCommand : IRequest
+{
+    public ulong? Context { get; set; }
+    public string Content { get; set; }
+}
+
+public class ProcessMessageHandler(DiscordSocketClient client) : IRequestHandler<ProcessMessageCommand>
+{
+    public Task Handle(ProcessMessageCommand request, CancellationToken cancellationToken)
+    {
+        if (request.Context == null) 
+            return Task.FromResult(Unit.Value);
+        
+        var channel = client.GetChannel(request.Context.Value) as ISocketMessageChannel;
+        
+        if (channel == null)
+            return Task.FromResult(Unit.Value);
+        
+        using var setTyping = channel.EnterTypingState();
+        channel.SendMessageAsync(request.Content);
+        setTyping.Dispose();
+
+        return Task.FromResult(Unit.Value);
+    }
+}