sysutils/cppinsights: New port: C++ Insights - See your source code with the eyes of a compiler

C++ Insights is a Clang-based tool that does a source-to-source
transformation. The goal of C++ Insights is to make things visible that
normally and intentionally happen behind the scenes.It's about the magic
the compiler does for us to make things work.

https://github.com/andreasfertig/cppinsights
https://cppinsights.io

PR: 278197