enum permissible value ancestors and parents methods

[sierra-moxon]

Adding methods to navigate "is_a" hierarchies for permissible values in enumerations.

[codecov-commenter]

Codecov Report

Merging #213 (07cd365) into main (2713585) will increase coverage by 0.01%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
+ Coverage   63.52%   63.54%   +0.01%     
==========================================
  Files          53       53              
  Lines        6103     6117      +14     
  Branches     1646     1650       +4     
==========================================
+ Hits         3877     3887      +10     
- Misses       1771     1774       +3     
- Partials      455      456       +1     

Impacted Files	Coverage Δ
linkml_runtime/loaders/rdf_loader.py	28.20% <ø> (ø)
linkml_runtime/utils/schemaview.py	86.40% <85.36%> (-0.39%)	:arrow_down:
linkml_runtime/linkml_model/meta.py	52.79% <100.00%> (ø)
linkml_runtime/utils/yamlutils.py	78.15% <0.00%> (+0.42%)	:arrow_up:

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