✨ NEW: Add nb_execution_raise_on_error config

[chrisjsewell]

closes #248
closes #392

[codecov]

Codecov Report

Merging #404 (62c3cae) into master (edb0daf) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #404      +/-   ##
==========================================
+ Coverage   80.07%   80.13%   +0.05%     
==========================================
  Files          20       20              
  Lines        2053     2059       +6     
==========================================
+ Hits         1644     1650       +6     
  Misses        409      409              

Flag	Coverage Δ
pytests	80.13% <100.00%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
myst_nb/core/config.py	79.77% <100.00%> (+0.22%)	⬆️
myst_nb/core/execute.py	92.39% <100.00%> (+0.43%)	⬆️

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