Some fixes for low rank and use pulp in math for simd

[aseyboldt]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 99.13043% with 3 lines in your changes missing coverage. Please review.

Project coverage is 71.69%. Comparing base (394c629) to head (ff479dd).
Report is 54 commits behind head on main.

Files with missing lines	Patch %	Lines
src/chain.rs	0.00%	1 Missing ⚠️
src/cpu_math.rs	85.71%	1 Missing ⚠️
src/low_rank_mass_matrix.rs	96.77%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (394c629) and HEAD (ff479dd). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (394c629)	HEAD (ff479dd)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #34       +/-   ##
===========================================
- Coverage   83.77%   71.69%   -12.08%     
===========================================
  Files           8       18       +10     
  Lines        1923     4830     +2907     
===========================================
+ Hits         1611     3463     +1852     
- Misses        312     1367     +1055     

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