Reorganize VB snippets - VS_Snippets_CLR

[gewarren]

The C# snippets in this repo are organized by namespace and API name, for example, this snippet is referenced in the XML remarks of the Comparer<T> class here. If a C# code snippet is referenced from a member of a type, then it's in a subfolder named with the member name, for example, https://github.com/dotnet/dotnet-api-docs/tree/main/snippets/csharp/System.Collections.Generic/ListT/Capacity. We should organize the Visual Basic snippets that can be found under https://github.com/dotnet/dotnet-api-docs/tree/main/snippets/visualbasic/VS_Snippets_CLR in a similar way. Once the snippets have been moved to their new directory, any references to that snippet from the XML files in this repo need to be updated too.