New port: devel/py-itanium_demangler

The Python Itanium Demangler is a pure Python parser for the Itanium C++
ABI symbol mangling language. Note that MSVC mangling language is not
supported.

This demangler generates an abstract syntax tree from mangled symbols,
which can be used for directly extracting type information, as opposed to
having to interpret the C++ source code corresponding to the demangled
symbol.

There is also a built-in AST stringifier, so the demangler can be used
as a replacement for c++filt or for formatting backtraces.

WWW: https://github.com/whitequark/python-itanium_demangler

PR: 244562