Add dtw_merge

[takenori-y]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.57%. Comparing base (4220c8f) to head (11fb454).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #149   +/-   ##
=======================================
  Coverage   99.57%   99.57%           
=======================================
  Files         259      259           
  Lines        9396     9412   +16     
=======================================
+ Hits         9356     9372   +16     
  Misses         40       40           

Flag	Coverage Δ
unittests	99.57% <100.00%> (+<0.01%)	⬆️

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