`EmailManager` is not supported, throws exception

Nobody has claimed this yet.

### Describe the bug

Depending on how you look at it I guess this might also be a feature request. In .NET MAUI we have [functionality](https://github.com/dotnet/maui/blob/main/src/Essentials/src/Email/Email.uwp.cs) that allows users to compose an email. For UWP we could use the code underneath to compose an email programmatically and present the user with a screen in their favorite email client to send the email.

```csharp
using Windows.ApplicationModel.Email;
EmailMessage message = new();
// Add to, cc, attachments, body, etc.

await EmailManager.ShowComposeNewEmailAsync(message);
```

When calling this from WinUI, we are presented with an exception "The request is not supported. (0x80070032)"

I've tried exploring alternatives like using `mailto:` or resorting to `MAPI`. The latter might be what this functionality is based on, but that would mean we have to add a lot of code that might already live with you.

### Steps to reproduce the bug

1. Implement code that tries to call `EmailManager`, see above
2. Run the code
3. Observe the exception being thrown


### Expected behavior

The functionality works as it did when running it through UWP which is: present the user with a compose email screen.

### Screenshots

_No response_

### NuGet package version

WinUI 3 - Windows App SDK 1.1.1

### Windows app type

- [X] UWP
- [X] Win32

### Device form factor

Desktop

### Windows version

Windows 11 (22H2): Build 22621

### Additional context

_No response_

Start with the EmailManager call and the linked .NET MAUI Email.uwp.cs implementation; compare the UWP and WinUI behavior and review the mailto/MAPI alternatives mentioned. Done means WinUI desktop apps can present a compose-email screen without the current 0x80070032 exception, supporting the email fields described in the issue.

Written by the indexing model from the issue text.