Refactor conductivity

[atztogo]

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[codecov]

Codecov Report

❌ Patch coverage is 92.26415% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.15%. Comparing base (70ff05f) to head (4e6d66d).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
phono3py/conductivity/lbte_init.py	31.03%	20 Missing ⚠️
phono3py/conductivity/lbte_calculator.py	79.16%	15 Missing ⚠️
phono3py/conductivity/build_components.py	96.61%	2 Missing ⚠️
phono3py/conductivity/collision_matrix_kernel.py	97.43%	2 Missing ⚠️
phono3py/conductivity/rta_calculator.py	97.26%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #527      +/-   ##
===========================================
- Coverage    78.23%   78.15%   -0.08%     
===========================================
  Files          114      113       -1     
  Lines        18453    18386      -67     
===========================================
- Hits         14437    14370      -67     
  Misses        4016     4016              

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