Add moyopy backend

[lan496]

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[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.09%. Comparing base (90836d3) to head (84fbfa4).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/spinspg/group.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #10      +/-   ##
===========================================
- Coverage    98.24%   98.09%   -0.16%     
===========================================
  Files            7        7              
  Lines          512      524      +12     
===========================================
+ Hits           503      514      +11     
- Misses           9       10       +1     

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