include msvc rust-specific information formatters

[rbtcollins]

There is a discussion that notes in VSCode that people are getting an error/warning about debug information formatters with codelldb on Windows.

Developers are steered to CodeLLDB by the vscode Rust ecosystem; the codelldb note that is referred to from that bug says that 'as it is assumed that users will primarily use WinDbg or Microsoft Visual Studio's debugger for this target' - I think that this assumption is wrong.

It would be great to include the rust debug information formatters for codelldb with the msvc toolchain.