Add codespaces

[bkielbasa]

The biggest why is making developer experience as good as possible and codespaces look like a good way to do it for new devs in the project

Ref:

• https://github.blog/2023-03-06-how-to-automate-your-dev-environment-with-dev-containers-and-github-codespaces/
• https://github.blog/2023-02-28-10-things-you-didnt-know-you-could-do-with-github-codespaces/