More efficient simple obo diffs

[cmungall]

• Adding a more efficient diff implementation for simpleobo
  • technically this is a violation of the DRY principle but one of the goals of the interface/impl split is to allow implementations to do custom implementations that may be faster
• Undoing some of Create release notes markdown output for diff command #605

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.07547% with 74 lines in your changes are missing coverage. Please review.

Project coverage is 75.52%. Comparing base (5dcedf5) to head (32bb849).

Files	Patch %	Lines
src/oaklib/io/streaming_markdown_writer.py	3.70%	26 Missing ⚠️
src/oaklib/cli.py	22.22%	14 Missing ⚠️
...ementations/simpleobo/simple_obo_implementation.py	90.97%	12 Missing ⚠️
tests/test_implementations/__init__.py	45.45%	12 Missing ⚠️
src/oaklib/interfaces/differ_interface.py	83.63%	9 Missing ⚠️
src/oaklib/utilities/mapping/mapping_validation.py	83.33%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #719      +/-   ##
==========================================
+ Coverage   75.45%   75.52%   +0.07%     
==========================================
  Files         268      268              
  Lines       31328    31429     +101     
==========================================
+ Hits        23638    23738     +100     
- Misses       7690     7691       +1     

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