Refactor WASM runner and logging functionality; add heartbeat task and improve initialization process

simulator/Program.cs

@@ -1,7 +1,4 @@
-using System;
-using System.IO;
 using System.Runtime.InteropServices;
-using System.Threading;
 using Zio;
 using Zio.FileSystems;
 
@@ -76,6 +73,7 @@ internal static class Program
     private static readonly Nova64Core.LogMessageDelegate LogMessage = (message) =>
     {
         Console.Write($"[Core] {message}");
+        Console.Out.Flush();
     };
 
     private static GCHandle? _ioHandle;