Add aws_cli package

[kylewlacy]

This PR adds a new package for the AWS CLI: the Amazon Web Services Command Line Interface.

This one ended up being trickier than expected, for 3 reasons:

1. It (currently) requires Python 3.12. I updated python to support both v3.12 and v3.13 in Update Python to support both v3.12 and v3.13 builds #216
2. It builds a native dependency, and requires libffi. I added a new libffi package and linked it to Python in Add libffi package #215
3. It has requirements.txt files that include hashes, but there are conflicting requirements around the packaging dependency (this only applies to the requirements-*-lock.txt files I believe, the standard requirements.txt file shouldn't have this problem but also doesn't have hashes). I solved this with a small patch file to resolve packaging to v24.2, which was the latest version used across all the files.

The actual packaging code was based heavily on the asciinema package. It'd be nice to write a general pythonInstall() function or something, but at least asciinema and aws_cli are different enough that I don't feel that it'd be easy to generalize them. My gut instinct is it'd be better to support a newer package manager first, such as uv.