Add velph-phonopy command

[atztogo]

Having this command, [phono3py.phonon] support was dropped.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 67.75701% with 69 lines in your changes missing coverage. Please review.

Project coverage is 72.78%. Comparing base (3159f2e) to head (007daed).
Report is 11 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/phelel/velph/cli/init/init.py	68.91%	23 Missing ⚠️
src/phelel/velph/cli/phonopy/__init__.py	55.55%	16 Missing ⚠️
src/phelel/velph/cli/phonopy/init.py	72.00%	14 Missing ⚠️
src/phelel/velph/cli/phonopy/generate.py	46.66%	8 Missing ⚠️
src/phelel/velph/cli/phono3py/__init__.py	0.00%	5 Missing ⚠️
src/phelel/velph/cli/phono3py/init.py	57.14%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #45      +/-   ##
===========================================
- Coverage    73.21%   72.78%   -0.44%     
===========================================
  Files           77       81       +4     
  Lines         5500     5647     +147     
===========================================
+ Hits          4027     4110      +83     
- Misses        1473     1537      +64     

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