support electronic tempeture data used in simplify; refactor post_fp_vasp

[njzjz]

Fix #1303.

[codecov]

Codecov Report

Patch coverage: 60.00% and project coverage change: -0.03% ⚠️

Comparison is base (beee7ef) 48.56% compared to head (aec086f) 48.54%.

❗ Current head aec086f differs from pull request most recent head 55154de. Consider uploading reports for the commit 55154de to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1329      +/-   ##
==========================================
- Coverage   48.56%   48.54%   -0.03%     
==========================================
  Files          82       82              
  Lines       14645    14658      +13     
==========================================
+ Hits         7112     7115       +3     
- Misses       7533     7543      +10     

Files Changed	Coverage Δ
dpgen/simplify/simplify.py	46.09% <0.00%> (-0.63%)	⬇️
dpgen/generator/run.py	67.41% <58.82%> (-0.18%)	⬇️
dpgen/util.py	94.17% <100.00%> (+0.49%)	⬆️

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