[performance]: optimize find_HIoIs()

[robomics]

On my dev machine the optimization results in a 10% improvement in single-threaded performance.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 31.42857% with 24 lines in your changes missing coverage. Please review.

Project coverage is 32.85%. Comparing base (8e96618) to head (2085f45).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/stripepy/utils/finders.py	34.61%	17 Missing ⚠️
src/stripepy/stripepy.py	0.00%	4 Missing ⚠️
src/stripepy/utils/regressions.py	40.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (8e96618) and HEAD (2085f45). Click for more details.

HEAD has 48 uploads less than BASE

Flag	BASE (8e96618)	HEAD (2085f45)
tests	unit	python-3.12
tests	unit	python-3.11
tests	unit	python-3.12
tests	unit	python-3.10
tests	unit	python-3.11
tests	unit	python-3.10
tests	integration	python-3.13
tests	integration	python-3.12
tests	integration	python-3.11
tests	integration	python-3.9
tests	integration	python-3.10
tests	integration	python-3.13
tests	integration	python-3.12
tests	integration	python-3.9
tests	integration	python-3.11
tests	integration	python-3.10

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #90       +/-   ##
===========================================
- Coverage   85.31%   32.85%   -52.46%     
===========================================
  Files          19       19               
  Lines        2478     2490       +12     
===========================================
- Hits         2114      818     -1296     
- Misses        364     1672     +1308     

Flag	Coverage Δ
[tests	integration	python-3.10](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	integration	python-3.10
[tests	integration	python-3.11](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	integration	python-3.11
[tests	integration	python-3.12](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	integration	python-3.12
[tests	integration	python-3.13](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	integration	python-3.13
[tests	integration	python-3.9](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	integration	python-3.9
[tests	unit	python-3.10](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.10
[tests	unit	python-3.11](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.11
[tests	unit	python-3.12](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.12
[tests	unit	python-3.13](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.13
[tests	unit	python-3.9](https://app.codecov.io/gh/paulsengroup/StripePy/pull/90/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.9

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[robomics]

Superseded by #91