Move library concepts from lists/resources to Drupal module

[dpi]

Fixes #62

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.08%. Comparing base (445602a) to head (7306ec8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #71      +/-   ##
============================================
- Coverage     98.13%   98.08%   -0.05%     
+ Complexity      234      228       -6     
============================================
  Files            35       35              
  Lines           483      471      -12     
============================================
- Hits            474      462      -12     
  Misses            9        9              

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