Fermion twist

[manuschneider]

-Added fermion twists, which corresponds to the P-gates in arXiv:2404.14611 -Cleaned up code and updated documentation -Made all methods return a pointer to the class to allow for chaining (e.g. UniTensor.contiguous().fermion_twists(). ...)

[codecov[bot]]

Codecov Report

:x: Patch coverage is 4.54545% with 63 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 35.19%. Comparing base (e87c3a2) to head (74caf0d). :warning: Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
include/UniTensor.hpp	5.55%	34 Missing :warning:
src/BlockFermionicUniTensor.cpp	5.55%	17 Missing :warning:
src/UniTensor_base.cpp	0.00%	12 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #703      +/-   ##
==========================================
+ Coverage   32.35%   35.19%   +2.84%     
==========================================
  Files         215      215              
  Lines       36363    33158    -3205     
  Branches    14597    13210    -1387     
==========================================
- Hits        11764    11671      -93     
+ Misses      22659    19573    -3086     
+ Partials     1940     1914      -26     

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[hunghaoti]

Is it possible to add some simple unit test?