Halt on KeyboardInterrupt

[kokorin]

Closes #53

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.76%. Comparing base (6fac6df) to head (8af6fb9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dbt_pumpkin/loader.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   92.00%   91.76%   -0.25%     
==========================================
  Files          10       10              
  Lines         763      765       +2     
==========================================
  Hits          702      702              
- Misses         61       63       +2     

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