FEAT add max-candidates in make_narx

[MatthewSZhang]

Checklist

• Used a personal fork to propose changes
• A reference to a related issue: FEAT add max candidate terms argument in make_narx #176
• A description of the changes: add max_candidates args for make_narx to subsample polynomial features by reservoir sampling.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e5cbafa) to head (421b775).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #181   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          598       611   +13     
=========================================
+ Hits           598       611   +13     

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