Refactor internal dictionaries module

[gerlero]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.13861% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 89.02%. Comparing base (1e987de) to head (27510f8).

❗ Current head 27510f8 differs from pull request most recent head f904a4b. Consider uploading reports for the commit f904a4b to get more accurate results

Files	Patch %	Lines
foamlib/_dictionaries/_serialization.py	79.36%	13 Missing ⚠️
foamlib/_dictionaries/__init__.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   89.13%   89.02%   -0.11%     
==========================================
  Files           4        7       +3     
  Lines         552      565      +13     
==========================================
+ Hits          492      503      +11     
- Misses         60       62       +2     

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