Implement polars string Replace and ReplaceMany

[lithomas1]

Description

Add support for pl.col.str.replace and pl.col.str.replace_many

Checklist

• [x] I am familiar with the Contributing Guidelines.
• [x] New or existing tests cover these changes.
• [x] The documentation is up to date with these changes.

All tests are verified passing locally

[lithomas1]

Thanks for the reviews!

I'll probably put this back in draft while your cudf.polars are getting merged.

I think I'm already hitting some conflicts with your PRs, so probably best to wait until that settles down.

[lithomas1]

This needs to wait until compat with polars 1.1 is achieved.

[lithomas1]

/merge