Add calculate_khat_bin_edges for Pareto k diagnostics

[jordandeklerk]

Adds this function here for use in arviz-plots. See arviz-devs/arviz-plots#356.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.93%. Comparing base (5578197) to head (e8d79f5).

Files with missing lines	Patch %	Lines
src/arviz_stats/base/stats_utils.py	87.50%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #257   +/-   ##
=======================================
  Coverage   84.92%   84.93%           
=======================================
  Files          42       42           
  Lines        5168     5183   +15     
=======================================
+ Hits         4389     4402   +13     
- Misses        779      781    +2     

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Documentation build overview

📚 arviz-stats | 🛠️ Build #30432696 | 📁 Comparing e8d79f5 against latest (5578197)

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Show files changed (7 files in total): 📝 7 modified | ➕ 0 added | ➖ 0 deleted

File	Status
api/generated/arviz_stats.eti.html	📝 modified
api/generated/arviz_stats.hdi.html	📝 modified
api/generated/arviz_stats.histogram.html	📝 modified
api/generated/arviz_stats.kde.html	📝 modified
api/generated/arviz_stats.loo_kfold.html	📝 modified
api/generated/arviz_stats.mode.html	📝 modified
api/generated/arviz_stats.qds.html	📝 modified