[CmdPal] Introduce Small, Medium, and Large sizing options for Details (#43956)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request
This PR introduces 3 new sizing options to the Details Panel in the
Extensions API.
- `Small` (Default)
- `Medium`
- `Large`
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## PR Checklist

- [x] Closes: #43251
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issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

Here's how it looks like:
```csharp
new ListItem(new NoOpCommand())
{
    Title = "Details on ListItems (Medium)",
    Details = new Details()
    {
        Title = "This item has medium details size",
        Body = "Each of these items can have a `Body` formatted with **Markdown**",
        Size = ContentSize.Medium,
    },
},
```

### Moving Pictures


![DetailsSize](https://github.com/user-attachments/assets/ae11b767-ecba-4b39-bd81-3e77eec93ed0)


<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

src/modules/cmdpal/extensionsdk/Microsoft.CommandPalette.Extensions.Toolkit/Details.cs

@@ -1,10 +1,11 @@
 // 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 Windows.Foundation.Collections;
 
 namespace Microsoft.CommandPalette.Extensions.Toolkit;
 
-public partial class Details : BaseObservable, IDetails
+public partial class Details : BaseObservable, IDetails, IExtendedAttributesProvider
 {
     public virtual IIconInfo HeroImage
     {
@@ -53,4 +54,21 @@ public partial class Details : BaseObservable, IDetails
     }
 
 = [];
+
+    public virtual ContentSize Size
+    {
+        get;
+        set
+        {
+            field = value;
+            OnPropertyChanged(nameof(Size));
+        }
+    }
+
+= ContentSize.Small;
+
+    public IDictionary<string, object>? GetProperties() => new ValueSet()
+    {
+        { "Size", (int)Size },
+    };
 }