✨ NEW: Add aiida-project rename command

[GeigerJ2]

Just realized that the project name I gave to something is not really fitting anymore to what I'm doing has evolved to. So it would be nice to have a rename command. Haven't really thought everything through¹, so this is more just a memo for our upcoming "aiida-project to the 🌔" time blocker.

Footnotes

1. E.g. to which level should the rename affect things? Ideally the directory (obv), but then it would also be nice to port the Python venv (export requirements and create new one, as renaming is discouraged?), and migrate/update the AiiDA data and config? Seems like quite a few steps that need to be taken care of in the backend, but might be something worth providing. ↩