Support Consuming C# 14 Extension Everything

Consider the following situation, where Vector128 is as defined in .NET Core 3.1 without operators. In a polyfill library aimed at supporting downlevel maths on older .NET runtimes. Providing an implementation is an option, but only at the introductory feature level. Thus everything else must be extensions - including operators.

```
Imports System

Module Program
Sub Main(args As String())
Dim test As Vector128(of Double) = Vector128.Create(2.0, 3.0)

Dim r = Polyfill.Vector128Net70.op_Addition(test, test) 'Workaround
Dim res = test + test 'Compile error
End Sub
End Module
```

VB.NET beign able to recognise and consume properties and operators defined as C# 14 extensions would be most helpful.

Start with the VB.NET repro in Module Program and compare the direct operator expression with the Polyfill.Vector128Net70.op_Addition workaround. Done means VB.NET can consume the C# 14 extension properties and operators for the Vector128 example without the explicit workaround.

Written by the indexing model from the issue text.