Refactor conductivity

[atztogo]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 92.34783% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.11%. Comparing base (70ff05f) to head (9d851b4).
⚠️ Report is 8 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	80.00%	14 Missing ⚠️
phono3py/conductivity/ms_smm19/kappa_solvers.py	93.18%	3 Missing ⚠️
phono3py/conductivity/build_components.py	96.61%	2 Missing ⚠️
phono3py/conductivity/collision_matrix_kernel.py	97.59%	2 Missing ⚠️
phono3py/conductivity/rta_calculator.py	97.33%	2 Missing ⚠️
phono3py/conductivity/njc23/kappa_solvers.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #527      +/-   ##
===========================================
- Coverage    78.23%   78.11%   -0.13%     
===========================================
  Files          114      113       -1     
  Lines        18453    18327     -126     
===========================================
- Hits         14437    14316     -121     
+ Misses        4016     4011       -5     

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