Implement enhanced PowerShell cmdlets with async handler, WebSocket, TLS, and more features

Co-authored-by: chkr1011 <6939810+chkr1011@users.noreply.github.com>

Source/MQTTnet.PowerShell/Cmdlets/UnregisterMqttMessageHandlerCmdlet.cs

@@ -0,0 +1,21 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Management.Automation;
+
+namespace MQTTnet.PowerShell.Cmdlets;
+
+[Cmdlet(VerbsLifecycle.Unregister, "MqttMessageHandler")]
+public class UnregisterMqttMessageHandlerCmdlet : PSCmdlet
+{
+    [Parameter(Mandatory = true, ValueFromPipeline = true)]
+    public required PsMqttSession Session { get; set; }
+
+    protected override void ProcessRecord()
+    {
+        // Clear all event handlers
+        Session.ClearMessageHandlers();
+        WriteObject($"All message handlers cleared for MQTT session.");
+    }
+}