CmdPal: Implement IDetailsCommand in details (#39911)

Implemented IDetailsCommands in details. This will close #38339.

This works very similar to Tags in that it is a list of commands. This
was done to allow for styling without the 12 spacing of the
ItemsRepeater and looks like you'd find in the OS-inbox like:


![image](https://github.com/user-attachments/assets/97ee1952-13bb-4c8b-a074-0347b04e0c2c)


![image](https://github.com/user-attachments/assets/8f6f1f72-4ea0-441d-893e-ae26aabdc922)

Also added to our sample extension:


![image](https://github.com/user-attachments/assets/ab3ce521-3479-448f-b4d6-9dfd09feb24f)

src/modules/cmdpal/ext/SamplePagesExtension/Pages/SampleListPageWithDetails.cs

@@ -5,6 +5,7 @@
 using System;
 using Microsoft.CommandPalette.Extensions;
 using Microsoft.CommandPalette.Extensions.Toolkit;
+using Microsoft.UI.Xaml;
 
 namespace SamplePagesExtension;
 
@@ -129,6 +130,25 @@ internal sealed partial class SampleListPageWithDetails : ListPage
                                 ],
                             },
                         },
+                        new DetailsElement()
+                        {
+                            Key = "Commands",
+                            Data = new DetailsCommands()
+                            {
+                                Commands = [
+                                    new ToastCommand("Hey! You clicked it!", MessageState.Success)
+                                    {
+                                        Name = "Do something amazing",
+                                        Icon = new("\uE945"),
+                                    },
+                                    new ToastCommand("I warned you!", MessageState.Error)
+                                    {
+                                        Name = "Don't click me",
+                                        Icon = new("\uEA39"),
+                                    },
+                               ],
+                            },
+                        },
                     ],
                 },
             }