fix: allow matching nan values in annotations (e.g. when b_factors are set to nan)

[Croydon-Brixton]

A tiny fix, to allow counting nan values as equal in annotations. This makes sense in cases where annotations are flagged as not available (e.g. b_factor = nan).

[codspeed-hq]

CodSpeed Performance Report

Merging #714 will not alter performance

_{Comparing Croydon-Brixton:fix/equal_nan_when_comparing_annotations (7ff00ed) with main (05e40cb)}

Summary

✅ 47 untouched benchmarks

[padix-key]

Hi, thanks for bringing this up. In my opinion you are right: When two AtomArrayhave NaN annotations at the same position, as a user I would expect that they are still the same. I would even suggest to be more strict and enforce this behavior (and remove the parameter), but I do not have a strong opinion here.

I only left a small nit, otherwise this looks good to me.

[Croydon-Brixton]

Thank you for the quick review @padix-key , I've updated the docstring as you suggested & fixed ruff. Good to merge from my side.