[WIP] Worker class

[dwhswenson]

Resolves #17. Resolves #18.

Some first ideas toward #16.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 72 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.91%. Comparing base (8719153) to head (3af9349).
⚠️ Report is 102 commits behind head on main.

Files with missing lines	Patch %	Lines
exorcist/worker.py	0.00%	72 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #19      +/-   ##
========================================
- Coverage   3.52%   1.91%   -1.62%     
========================================
  Files          4       5       +1     
  Lines         85     157      +72     
========================================
  Hits           3       3              
- Misses        82     154      +72     

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[richardjgowers]

docstrings