Rename package to OpenMaui.Controls.Linux

- Changed package ID from Microsoft.Maui.Controls.Linux to OpenMaui.Controls.Linux
- Updated all project files, namespaces, and documentation
- Renamed template from maui-linux to openmaui-linux
- Updated NuGet badges and install commands
- Maintained MarketAlly LLC as owner/author

Package: OpenMaui.Controls.Linux
Template: OpenMaui.Linux.Templates
Install: dotnet add package OpenMaui.Controls.Linux --prerelease

templates/openmaui-linux-app/Program.cs

@@ -0,0 +1,18 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using OpenMaui.Platform.Linux.Linux;
+
+namespace OpenMauiLinuxApp;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        var app = LinuxApplication.CreateBuilder()
+            .UseApp<App>()
+            .Build();
+
+        app.Run();
+    }
+}