Add Start method to debugger server and client

UIX/Microsoft/Iris/Debug/IDebuggerState.cs

@@ -5,6 +5,8 @@ namespace Microsoft.Iris.Debug;
 
 public interface IDebuggerState
 {
+    void Start();
+
     InterpreterCommand DebuggerCommand { get; set; }
 }
 

UIX/Microsoft/Iris/Debug/InProcDebugger.cs

@@ -14,6 +14,8 @@ public class InProcDebugger : IDebuggerClient, IDebuggerServer
     public event EventHandler<InterpreterEntry> InterpreterExecute;
     public event Action<string> DispatcherStep;
 
+    public void Start() { }
+
     public void RequestLineNumberTable(string uri, Action<MarkupLineNumberEntry[]> callback)
     {
         var lineNumberTable = ((IDebuggerServer)this).OnLineNumberTableRequested(uri);

UIX/Microsoft/Iris/Debug/SystemNet/NetDebuggerClient.cs

@@ -44,7 +44,10 @@ public class NetDebuggerClient : IDebuggerClient, IRemoteDebuggerState, IDisposa
         ConnectionUri = connectionUri ?? DebugRemoting.DEFAULT_TCP_URI;
         _socket = new(SocketType.Stream, ProtocolType.Tcp);
         _formatter = DebugRemoting.CreateBsonFormatter();
+    }
 
+    public void Start()
+    {
         System.Threading.Thread connectThread = new(ConnectLoop) { IsBackground = true };
         connectThread.Start();
     }

UIX/Microsoft/Iris/Debug/SystemNet/NetDebuggerServer.cs

@@ -45,10 +45,13 @@ public class NetDebuggerServer : IDebuggerServer, IRemoteDebuggerState, IDisposa
 
         _formatter = DebugRemoting.CreateBsonFormatter();
 
+        Current = this;
+    }
+
+    public void Start()
+    {
         System.Threading.Thread connectThread = new(ConnectLoop) { IsBackground = true };
         connectThread.Start();
-
-        Current = this;
     }
 
     public MarkupLineNumberEntry[] OnLineNumberTableRequested(string uri)