Rename the [Ee]xts dir to ext (#38852)

**WARNING:** This PR will probably blow up all in-flight PRs

at some point in the early days of CmdPal, two of us created seperate
`Exts` and `exts` dirs. Depending on what the casing was on the branch
that you checked one of those out from, it'd get stuck like that on your
PC forever.

Windows didn't care, so we never noticed.

But GitHub does care, and now browsing the source on GitHub is basically
impossible.

Closes #38081

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.TimeDate/Helpers/AvailableResult.cs

@@ -0,0 +1,84 @@
+// 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.Runtime.CompilerServices;
+using Microsoft.CommandPalette.Extensions.Toolkit;
+
+[assembly: InternalsVisibleTo("Microsoft.PowerToys.Run.Plugin.TimeDate.UnitTests")]
+
+namespace Microsoft.CmdPal.Ext.TimeDate.Helpers;
+
+internal class AvailableResult
+{
+    /// <summary>
+    /// Gets or sets the time/date value
+    /// </summary>
+    internal string Value { get; set; }
+
+    /// <summary>
+    /// Gets or sets the text used for the subtitle and as search term
+    /// </summary>
+    internal string Label { get; set; }
+
+    /// <summary>
+    /// Gets or sets an alternative search tag that will be evaluated if label doesn't match. For example we like to show the era on searches for 'year' too.
+    /// </summary>
+    internal string AlternativeSearchTag { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value indicating the type of result
+    /// </summary>
+    internal ResultIconType IconType { get; set; }
+
+    /// <summary>
+    /// Returns the path to the icon
+    /// </summary>
+    /// <param name="theme">Theme</param>
+    /// <returns>Path</returns>
+    public IconInfo GetIconInfo()
+    {
+        return IconType switch
+        {
+            ResultIconType.Time => ResultHelper.TimeIcon,
+            ResultIconType.Date => ResultHelper.CalendarIcon,
+            ResultIconType.DateTime => ResultHelper.TimeDateIcon,
+            _ => null,
+        };
+    }
+
+    public ListItem ToListItem()
+    {
+        return new ListItem(new CopyTextCommand(this.Value))
+        {
+            Title = this.Value,
+            Subtitle = this.Label,
+            Icon = this.GetIconInfo(),
+        };
+    }
+
+    public int Score(string query, string label, string tags)
+    {
+        // Get match for label (or for tags if label score is <1)
+        var score = StringMatcher.FuzzySearch(query, label).Score;
+        if (score < 1)
+        {
+            foreach (var t in tags.Split(";"))
+            {
+                var tagScore = StringMatcher.FuzzySearch(query, t.Trim()).Score / 2;
+                if (tagScore > score)
+                {
+                    score = tagScore / 2;
+                }
+            }
+        }
+
+        return score;
+    }
+}
+
+public enum ResultIconType
+{
+    Time,
+    Date,
+    DateTime,
+}