added pybind for UniTensor.apply() and apply_()

[manuschneider]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.26%. Comparing base (e87c3a2) to head (f460da4).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #733      +/-   ##
==========================================
+ Coverage   32.35%   35.26%   +2.91%     
==========================================
  Files         215      215              
  Lines       36363    33095    -3268     
  Branches    14597    13196    -1401     
==========================================
- Hits        11764    11670      -94     
+ Misses      22659    19511    -3148     
+ Partials     1940     1914      -26     

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