feat!: Removes inplace option for `pandas.core.resample.Resampler.i…

[cbpygit]

…nterpolate`. Fixes / cleans up related test cases.

• closes BUG: In main, using resample().interpolate(inplace=True) raises an exception #58690 (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

[cbpygit]

@MarcoGorelli somehow it did not auto-assign the reviewers. But in any case, here we are :)

[Aloqeely]

Do these need to be deprecated first? You can use the deprecate_kwarg decorator for that

[cbpygit]

Do these need to be deprecated first? You can use the deprecate_kwarg decorator for that

I don't know what the exact policy is. But as far as I understand the deprecation tells the user that a certain future change will change the API. This does not apply here, as the inplace-functionality is already broken. We would need to add the deprecation to pandas 2 to inform users about the upcoming change, and to ease migration. But I guess this would need a separate PR that targets the next 2.x release.

[MarcoGorelli]

Do these need to be deprecated first?

Thanks @Aloqeely - in general, yes, this would require a deprecation. However, here, the change is going to breaking anyway (in order to fix a historic feature bug), so to be honest I'd be OK removing inplace without warning too

[cbpygit]

@mroeschke can we merge this? 😄

[mroeschke]

It appears that a lot of interpolate usages are still modified in the PR. Only tests that used to call.resample(...).interpolate(interpolate=) should have been changed