CLN/REF: Unify Arithmetic Methods

[jbrockmendel]

2 goals here.

First is to end up with a single implementation for our arithmetic ops. By implementing the missing methods directly on DTA/PA, we make it so we don't need to special-case inside the Index.__foo__ methods, so can dispatch to Series more directly.

Second is to get the wrapper defined in_arith_method_SERIES to the point where we can use it block-wise instead of column-wise, to address the recent perf issues. This makes progress towards that goal by tightening up the allowed types in masked_arith_op

Oh, and we also get rid of a usage of values_from_object, which is adjacent to #27165 and #27167

[TomAugspurger]

Looks quite nice, thanks.

I think @jreback is fixing the numpy dev CI failure.

[jorisvandenbossche]

Didn't look at the actual PR, but just to note: I think we should stop merging such cleaning / refactoring PRs before 0.25 (or already branch). Which goes for most of Brock's PRs (nothing personal, Brock, it is just that you are doing useful stuff that touches existing code ;))

[jreback]

Didn't look at the actual PR, but just to note: I think we should stop merging such cleaning / refactoring PRs before 0.25 (or already branch). Which goes for most of Brock's PRs (nothing personal, Brock, it is just that you are doing useful stuff that touches existing code ;))

well then we should branch / release. These are + PRs and to be honest if all of the tests pass I don't see a reason to not merge.

[jbrockmendel]

we should stop merging such cleaning / refactoring PRs before 0.25 (or already branch).

+1

[jreback]

thanks @jbrockmendel nice code removal.