Description

This MR would like to introduce the development and maintenance of @pyscript/core related libraries (and more) that don't strictly belong to core itself but can be used to enhance PyScript based development.

The only current library in here is alien-signals as pure Python port done by me, while developing PEP750 related tdom library.

More libraries might land in this space but the idea here is to publish these libraries under our @pyscript namespace so that users can use related CDNs to optionally bring in extra features to PyScript core.

Changes

• created a libs folder (lib was ignored in our config I believe for valid reasons)
• created a script to build libraries as .tar.gz (native in both Pyodide and MicroPython)
• tested such artifact works as expected in both Pyodide and MicroPython

Checklist

• I have checked make build works locally.
• I have created / updated documentation for this change (if applicable).