Add support for manipulating DimensionSets

[gerlero]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.59259% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 89.46%. Comparing base (7be7a99) to head (68d3bc3).

Files	Patch %	Lines
foamlib/_dictionaries.py	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   89.32%   89.46%   +0.14%     
==========================================
  Files           4        4              
  Lines         515      541      +26     
==========================================
+ Hits          460      484      +24     
- Misses         55       57       +2     

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