FEAT add minimize solver for NARX

[MatthewSZhang]

Checklist

• Used a personal fork to propose changes
• A reference to a related issue: FEAT support minimize optimizer in SciPy for NARX fitting #213
• A description of the changes: add minimize solver and associated tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (020cbca) to head (941ca3e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #221      +/-   ##
===========================================
+ Coverage   99.49%   100.00%   +0.50%     
===========================================
  Files          10        10              
  Lines         799       853      +54     
===========================================
+ Hits          795       853      +58     
+ Misses          4         0       -4     

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