[Settings][PTRun]Improve XAML and settings page loading (#32643)

* Improve Run settings page performance

* Use ItemTemplateSelector for plugin options
* Use ItemsRepeater for plugins list

* fix xaml formatting

src/settings-ui/Settings.UI/Converters/RunOptionTemplateSelector.cs

@@ -0,0 +1,60 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using Microsoft.PowerToys.Settings.UI.Library;
+using Microsoft.PowerToys.Settings.UI.ViewModels;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Microsoft.PowerToys.Settings.UI.Converters
+{
+    public sealed class RunOptionTemplateSelector : DataTemplateSelector
+    {
+        public DataTemplate CheckBoxTemplate { get; set; }
+
+        public DataTemplate ComboBoxTemplate { get; set; }
+
+        public DataTemplate TextboxTemplate { get; set; }
+
+        public DataTemplate NumberBoxTemplate { get; set; }
+
+        public DataTemplate MultilineTextBoxTemplate { get; set; }
+
+        public DataTemplate CheckBoxComboBoxTemplate { get; set; }
+
+        public DataTemplate CheckBoxTextBoxTemplate { get; set; }
+
+        public DataTemplate CheckBoxMultilineTextBoxTemplate { get; set; }
+
+        public DataTemplate CheckBoxNumberBoxTemplate { get; set; }
+
+        /// <summary>
+        /// Gets or sets an empty template used as fall back in case of malformed data
+        /// </summary>
+        public DataTemplate EmptyTemplate { get; set; }
+
+        protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
+        {
+            if (item is PluginAdditionalOptionViewModel optionViewModel)
+            {
+                return optionViewModel.Type switch
+                {
+                    PluginAdditionalOption.AdditionalOptionType.Checkbox => CheckBoxTemplate,
+                    PluginAdditionalOption.AdditionalOptionType.Combobox => ComboBoxTemplate,
+                    PluginAdditionalOption.AdditionalOptionType.Textbox => TextboxTemplate,
+                    PluginAdditionalOption.AdditionalOptionType.Numberbox => NumberBoxTemplate,
+                    PluginAdditionalOption.AdditionalOptionType.MultilineTextbox => MultilineTextBoxTemplate,
+                    PluginAdditionalOption.AdditionalOptionType.CheckboxAndCombobox => CheckBoxComboBoxTemplate,
+                    PluginAdditionalOption.AdditionalOptionType.CheckboxAndTextbox => CheckBoxTextBoxTemplate,
+                    PluginAdditionalOption.AdditionalOptionType.CheckboxAndNumberbox => CheckBoxNumberBoxTemplate,
+                    PluginAdditionalOption.AdditionalOptionType.CheckboxAndMultilineTextbox => CheckBoxMultilineTextBoxTemplate,
+                    _ => EmptyTemplate,
+                };
+            }
+
+            throw new ArgumentException("Item must be an PluginAdditionalOptionViewModel", nameof(item));
+        }
+    }
+}