AppLinks in iOS return "No IAppIndexingProvider"

### Description

In Xamarin Forms, Using the AppLinks nuget package was straightforward in iOS and required no initialization.

In .NET MAUI, on iOS, AppLinks is built in, but throws an initialization error. It isn't clear from the documentation how to resolve this. This is the case whether an Entitlements.plist declaration is given or not.

### Steps to Reproduce

1. create file new .net maui project
2. Add code to create applinks
3. Witness exception on invocation

```
var url = $"https://en.wikipedia.org/wiki/Steve_Jobs";

var entry = new AppLinkEntry
{
Title = "Steve Jobs",
Description = "President",
AppLinkUri = new Uri(url, UriKind.RelativeOrAbsolute),
IsLinkActive = true,
Thumbnail = ImageSource.FromUri(new Uri("https://cdn.dribbble.com/users/160522/screenshots/1179084/stevejobs-01.jpg", UriKind.RelativeOrAbsolute))
};

entry.KeyValues.Add("contentType", "Employee");
entry.KeyValues.Add("appName", "MauiBug_AppLinks");
try
{
Application.Current.AppLinks.RegisterLink(entry);
}
catch (ArgumentException ex)
{
//TODO: resolve "No IAppIndexingProvider was provided" exception
DisplayAlert("Error", ex.Message, "Cancel");
}
```

### Link to public reproduction project repository

https://github.com/edgiardina/MauiBug_AppLinks_NoIAppIndexing

### Version with bug

7.0 (current)

### Last version that worked well

Unknown/Other

### Affected platforms

iOS

### Affected platform versions

iOS 16.1 (but appears to affect all iOS versions)

### Did you find any workaround?

_No response_

### Relevant log output

_No response_