perf: use total cmp for ordered float

[chebbyChefNEQ]

TL;DR: PartialOrd impl for f32 requires two cmp instructions and PartialOrd::lt is not reduced to a single instruction. With total_cmp we avoid this overhead. See https://godbolt.org/z/ez4EaEs3W

Note: maybe we could gain more perf by implementing a NaN-less cmp?

V1:

Running query with nprobes: 1, refine_factor: 0
Time: 652.877µs

Running query with nprobes: 10, refine_factor: 0
Time: 818.418µs

Running query with nprobes: 50, refine_factor: 0
Time: 1.406433ms

Running query with nprobes: 100, refine_factor: 0
Time: 1.747243ms

Running query with nprobes: 512, refine_factor: 0
Time: 5.754752ms

V3 before perf fix

Running query with nprobes: 1, refine_factor: 0
Time: 752.659µs

Running query with nprobes: 10, refine_factor: 0
Time: 2.379638ms

Running query with nprobes: 50, refine_factor: 0
Time: 9.518057ms

Running query with nprobes: 100, refine_factor: 0
Time: 17.623498ms

Running query with nprobes: 512, refine_factor: 0
Time: 39.43036ms

V3 after perf fix

Running query with nprobes: 1, refine_factor: 0
Time: 644.933µs

Running query with nprobes: 10, refine_factor: 0
Time: 1.512715ms

Running query with nprobes: 50, refine_factor: 0
Time: 5.974101ms

Running query with nprobes: 100, refine_factor: 0
Time: 9.848213ms

Running query with nprobes: 512, refine_factor: 0
Time: 23.058848ms

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.58%. Comparing base (4812ac0) to head (4f96145).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3059   +/-   ##
=======================================
  Coverage   77.57%   77.58%           
=======================================
  Files         240      240           
  Lines       78636    78636           
  Branches    78636    78636           
=======================================
+ Hits        61005    61012    +7     
- Misses      14496    14498    +2     
+ Partials     3135     3126    -9     

Flag	Coverage Δ
unittests	77.58% <100.00%> (+<0.01%)	⬆️

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