Modularizing TRSP

[jmlarson1]

Moving the TRSP in pounders.py to be a stand-alone function. This will allow us to clean pounder.py a bit and allow us to test other QP/TRSP solvers.

@mmenickelly I found no difference with output from the Extensive tests before/after this change. Also no change when all tests used nf_max = 500

@jared321

• Thoughts on moving the minq check out of pounders.py to the to the TRSP?
• With that move, I don't want to do the minq check every TRSP call. I also didn't want global variables to mark/check if the check is okay. I believe lru_cache is the best way to have this done, but I'm not certain.
• Thoughts on mpi4py in the Extensive tests? (I regularly add such code before running those tests. Others might want to as well, but the test is functional if mpi4py isn't available.)

[codecov]

Codecov Report

❌ Patch coverage is 78.94737% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.33%. Comparing base (538a7ad) to head (e4afcc0).

Files with missing lines	Patch %	Lines
pounders/py/solve_trsp.py	84.61%	4 Missing ⚠️
pounders/py/pounders.py	66.66%	2 Missing ⚠️
pounders/py/pounders_concurrent.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #284      +/-   ##
==========================================
+ Coverage   95.29%   95.33%   +0.04%     
==========================================
  Files         103      104       +1     
  Lines        4847     4847              
==========================================
+ Hits         4619     4621       +2     
+ Misses        228      226       -2     

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