Handle `AsParameters`-enabled types with indexers in request delegate creation

Follow-up to https://github.com/dotnet/aspnetcore/pull/47914#discussion_r1185483963.

The implementation for the `AsParameters` feature in both RDF and RDG doesn't currently handle types that contain indexers:

```csharp
public class ClassWithIndexer
{
private int[] arr = new int[100];

public int this[int i]
{
get { return arr[i]; }
set { arr[i] = value; }
}
}
```

We'll want to explore either:

- Adding support for this feature
- Explicitly disabling support for types that contain indexers with RDF

If we do consider adding support, we may want to tie this with the existing array binding features in RDF.