Add new mode for Pade coefficients optimization

[takenori-y]

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[codecov]

Codecov Report

❌ Patch coverage is 99.33775% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.57%. Comparing base (087cca6) to head (583f547).
⚠️ Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
diffsptk/modules/mglsadf.py	99.23%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #159    +/-   ##
========================================
  Coverage   99.56%   99.57%            
========================================
  Files         261      261            
  Lines        9520     9663   +143     
========================================
+ Hits         9479     9622   +143     
  Misses         41       41            

Flag	Coverage Δ
unittests	99.57% <99.33%> (+<0.01%)	⬆️

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