same cv splits across models

[mastoffel]

• adds random_state() to KFold to have the same splits across models
• adds checks for cross_validate object, currently only allowing KFold

closes #261

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
autoemulate
compare.py
utils.py					382
autoemulate/emulators
gaussian_process.py
tests
test_ui.py
test_utils.py
Project Total

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.48%. Comparing base (3daa3ed) to head (421b56e).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
autoemulate/utils.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #265      +/-   ##
==========================================
+ Coverage   92.45%   92.48%   +0.03%     
==========================================
  Files          62       62              
  Lines        3618     3635      +17     
==========================================
+ Hits         3345     3362      +17     
  Misses        273      273              

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