Test set split

[mastoffel]

• validate on test set when hyperparameter tuning, but keeping cross-validation when comparing models using defaults.

resolves #118

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
autoemulate
compare.py					210, 310
cross_validate.py
plotting.py
printing.py					31-33, 40-42
utils.py
tests
test_cross_validate.py
Project Total

This report was generated by python-coverage-comment-action

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (a70aa6e) 91.54% compared to head (c36ecc8) 91.61%.

Files	Patch %	Lines
autoemulate/printing.py	62.50%	6 Missing ⚠️
autoemulate/compare.py	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
+ Coverage   91.54%   91.61%   +0.06%     
==========================================
  Files          40       40              
  Lines        1739     1788      +49     
==========================================
+ Hits         1592     1638      +46     
- Misses        147      150       +3     

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