Hide internal APIs and optimize performance

[lan496]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.41026% with 53 lines in your changes missing coverage. Please review.

Project coverage is 88.07%. Comparing base (ed5fc8e) to head (1ba6fb4).

Files with missing lines	Patch %	Lines
moyo/src/data/hall_symbol.rs	80.24%	49 Missing ⚠️
moyopy/src/lib.rs	0.00%	2 Missing ⚠️
moyo/src/search/solve.rs	91.66%	1 Missing ⚠️
moyo/src/search/symmetry_search.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   88.08%   88.07%   -0.01%     
==========================================
  Files          35       36       +1     
  Lines        4891     4881      -10     
==========================================
- Hits         4308     4299       -9     
+ Misses        583      582       -1     

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