Codespaces template(s) for MicroPython

[Josverl]

Now that it has been announced at GitHub Universe that

• all developers will have access to GitHub Codespaces (up to 60 hours / month) ,
• Codespaces can be used in the browser , VSCode and PyCharm

I would suggest to add one (or a few) configuration profiles to simplify the setup and configuration for contributors.
I think we can add most of the common tools, prerreq and pre-commit-hooks in a common devcontainer,
and add specialized devcontainers for some of the ports that require different/conflicting tools.

https://docs.github.com/en/codespaces/setting-up-your-project-for-codespaces