test(python): Add benchmark tests for join_where with inequalities

[adamreeve]

This is a follow-up to #18365 to add a couple of benchmarks for the IEJoin algorithm.

These take around 0.01 s using a release build on my machine, compared with around 3 s if doing a cross join then filtering.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.93%. Comparing base (6076421) to head (7b2d44e).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18614      +/-   ##
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- Coverage   79.93%   79.93%   -0.01%     
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  Files        1505     1505              
  Lines      202628   202628              
  Branches     2873     2873              
==========================================
- Hits       161976   161967       -9     
- Misses      40104    40113       +9     
  Partials      548      548              

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