feat(rust!,python): Extend datetime expression function with time zone/time unit parameters

[stinodego]

Closes #7416

Changes:

• Add time_unit, time_zone and use_earliest arguments to the datetime expression function
• On the Rust side, move everything into the standard expression architecture.

Paging @MarcoGorelli for a review 😄

[ritchie46]

Wow! TIL about rust! 🤯

[stinodego]

Wow! TIL about rust! 🤯

I added this because a lot of our changes break Rust but not Python. Recently, Rust Polars 0.31.1 was released, which should really have been 0.32.0 as it has plenty of changes that could be considered breaking.

So yes, you can add ! to a scope now :) that should make the Rust changelogs more useful.

[ritchie46]

Recently, Rust Polars 0.31.1 was released, which should really have been 0.32.0 as it has plenty of changes that could be considered breaking.

No, the breaking release was already going from 0.30 to 0.31 :) The 0.31.1 release was only an attempt to build the docs.

But, I do agree that we must have the breaking changes in the changelog.

[MarcoGorelli]

Nice, no objections!