Add Dewey Decimal Classification, AFTOL Categories, and improve BARTOC import

[cthoyt]

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[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (de7d0aa) 40.82% compared to head (0bbc587) 40.80%.

Files	Patch %	Lines
src/bioregistry/external/bartoc.py	16.66%	5 Missing ⚠️
src/bioregistry/schema/struct.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1017      +/-   ##
==========================================
- Coverage   40.82%   40.80%   -0.03%     
==========================================
  Files         138      138              
  Lines        7928     7935       +7     
  Branches     1847     1848       +1     
==========================================
+ Hits         3237     3238       +1     
- Misses       4489     4495       +6     
  Partials      202      202              

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