OBO compliance suite (redux of #693)

[cmungall]

Replaying #693

• First pass at oboformat and obographs conformance suite.
• Allow choice of format when exporting OWL. Addung missing features to obo conversion
• lint
• lint
• Lint. Removing prints.
• Added format_utilities.py -- see Dumpers and loaders: Separate concept of syntax and datamodel #687

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.73684% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 75.87%. Comparing base (10ccb21) to head (0c639e6).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...aklib/converters/obo_graph_to_rdf_owl_converter.py	87.50%	1 Missing ⚠️
...lib/implementations/simpleobo/simple_obo_parser.py	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #715      +/-   ##
==========================================
+ Coverage   75.76%   75.87%   +0.11%     
==========================================
  Files         264      266       +2     
  Lines       30583    30817     +234     
==========================================
+ Hits        23171    23383     +212     
- Misses       7412     7434      +22     

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