FEAT add time-narx to evaluate opt speed of narx fit

[MatthewSZhang]

Checklist

• Used a personal fork to propose changes
• A reference to a related issue: Add speed test for NARX evaluation with pixi #59
• A description of the changes: add time-narx pixi task to evaluate optimisation speed of fitting of narx

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d4306c4) to head (84b2f83).
Report is 69 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##              main       #70    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            3         6     +3     
  Lines          110       603   +493     
==========================================
+ Hits           110       603   +493     

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