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/Microsoft.CmdPal.UI/Converters/DetailsDataTemplateSelector.cs

@@ -18,6 +18,8 @@ public partial class DetailsDataTemplateSelector : DataTemplateSelector
 
     public DataTemplate? TagTemplate { get; set; }
 
+    public DataTemplate? CommandTemplate { get; set; }
+
     protected override DataTemplate? SelectTemplateCore(object item)
     {
         if (item is DetailsElementViewModel element)
@@ -27,6 +29,7 @@ public partial class DetailsDataTemplateSelector : DataTemplateSelector
             {
                 DetailsSeparatorViewModel => SeparatorTemplate,
                 DetailsLinkViewModel => LinkTemplate,
+                DetailsCommandsViewModel => CommandTemplate,
                 DetailsTagsViewModel => TagTemplate,
                 _ => null,
             };