Refactoring of velph-init: define KpointsData

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 84.33735% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.82%. Comparing base (4f2ebe0) to head (bfd097d).
⚠️ Report is 62 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/phelel/velph/cli/init/init.py	82.35%	12 Missing ⚠️
src/phelel/velph/utils/vasp.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #116      +/-   ##
===========================================
+ Coverage    72.07%   72.82%   +0.75%     
===========================================
  Files           81       81              
  Lines         5791     5940     +149     
===========================================
+ Hits          4174     4326     +152     
+ Misses        1617     1614       -3     

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