Making ordered set reversible

[yfukai]

I encountered a case in which I would like to get the last element of Selection. Since OrderedSet is dict-based, I thought it makes sense to make it reversible so that we can access the last element by next(reversed(s)).

With this motivation, this pull request adds support for reversing iteration in the EventedOrderedSet and OrderedSet classes, and introduces new tests to verify this behavior.

Enhancements to Ordered Set Containers:

• Added a __reversed__ method to EventedOrderedSet to support reversed iteration, enabling the use of Python's built-in reversed() function on instances of this class.

Testing Improvements:

• Introduced the test_iterator function in tests/containers/test_evented_set.py to validate both forward and reversed iteration for OrderedSet and EventedOrderedSet, ensuring correct order and compatibility with Python's iterator protocol.

[codspeed-hq]

CodSpeed Performance Report

Merging #395 will not alter performance

_{Comparing yfukai:ordered_set_reverse (9723412) with main (250f703)}

Summary

✅ 67 untouched

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.75%. Comparing base (250f703) to head (9723412).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #395      +/-   ##
==========================================
- Coverage   99.75%   99.75%   -0.01%     
==========================================
  Files          23       23              
  Lines        2459     2456       -3     
==========================================
- Hits         2453     2450       -3     
  Misses          6        6              

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[tlambert03]

thanks @yfukai! Nice feature 👍