feat: completely refactor alias tracking and support nw.all, nw.nth, and selectors across the API

[MarcoGorelli]

https://youtu.be/0JGpveomN9A

What type of PR is this? (check all applicable)

• 💾 Refactor
• ✨ Feature
• 🐛 Bug Fix
• 🔧 Optimization
• 📝 Documentation
• ✅ Test
• 🐳 Other

Related issues

• Related issue #<issue number>
• Closes #<issue number>

Checklist

• Code follows style guide (ruff)
• Tests added
• Documented the changes

If you have comments or can explain your changes, please do so below

[FBruzzesi]

Amazing stuff! I tried to review one lazy and one eager backend in depth, and then assumed that the same changes apply to all others - I also re-watched the live streaming to get a better high level understanding of it!

I was expecting to see some other tests to XPASS for pyspark, I will try them locally later today!

As a bonus, I think there could be a good opportunity to factor out name namespace and selectors, but definitly let's do it in another PR.

[MarcoGorelli]

thanks @FBruzzesi !

I was expecting to see some other tests to XPASS for pyspark, I will try them locally later today!

I think we need a further refactor for that to happen, so that we only use .over when absolutely necessary

[FBruzzesi]

Noticed a couple of list comprehensions