Add parse extra (optional dependencies).

[fabiocaccamo]

#300

[codecov]

Codecov Report

Patch coverage: 86.36% and project coverage change: -0.09 ⚠️

Comparison is base (d35a481) 96.53% compared to head (9f1d5b1) 96.44%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #303      +/-   ##
==========================================
- Coverage   96.53%   96.44%   -0.09%     
==========================================
  Files          61       61              
  Lines        1846     1857      +11     
==========================================
+ Hits         1782     1791       +9     
- Misses         64       66       +2     

Flag	Coverage Δ
unittests	96.44% <86.36%> (-0.09%)	⬇️

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Impacted Files	Coverage Δ
benedict/dicts/parse/parse_util.py	98.73% <85.71%> (-1.27%)	⬇️
benedict/extras.py	94.11% <87.50%> (+0.78%)	⬆️

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