Visual Studio / Visual Studio Code integration for compiling and verifying BPF programs

The developer experience for BPF programs in Visual Studio could be improved by two options:
1) Add a built-in build rule for BPF programs (so the developer doesn't need to manually specify clang options).
2) Add a context menu option to verify a BPF program.

I believe these two options would significantly improve the overall developer experience using VS or VS Code and BPF.

Start by mapping the existing Visual Studio and Visual Studio Code workflows for compiling and verifying BPF programs. Define how a built-in BPF build rule and a context-menu verification option should behave; done means both workflows are specified and implemented without requiring manually entered clang options.

Written by the indexing model from the issue text.