remove utils.dictionary module

[ArneBinder]

including flatten_dict and list_of_dicts2dict_of_lists. But re-export respective methods from pie_core for backwards compatibility.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.76%. Comparing base (cc37a0d) to head (7a55499).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
- Coverage   95.76%   95.76%   -0.01%     
==========================================
  Files          68       68              
  Lines        6165     6156       -9     
==========================================
- Hits         5904     5895       -9     
  Misses        261      261              

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