Extract category from article

[codesalatdev]

This PR adds the ability to extract the Level 3 category of an article by its id. This also re-enables the parameter add_category_name for the function get_article.

Fixes #15

[codecov]

Codecov Report

❌ Patch coverage is 81.03448% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.92%. Comparing base (66b02e6) to head (af44271).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/python_picnic_api2/helper.py	75.67%	9 Missing ⚠️
src/python_picnic_api2/client.py	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   71.36%   76.92%   +5.55%     
==========================================
  Files           4        4              
  Lines         227      260      +33     
==========================================
+ Hits          162      200      +38     
+ Misses         65       60       -5     

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[codesalatdev]

client.get_article("s1072202", add_category=True)

output:

{'category': {'l2_id': 19401, 'l3_id': 19624, 'name': 'Kaffeegetränke'}, 'name': 'Arla Starbucks Starbucks Caffè Latte Eiskaffee', 'id': 's1072202'}

This is a breaking change.