Implement Chain normalization by mixed canonization

[Todorbsc]

Closes #18

[jofrevalles]

Agree with @mofeing comments, and it is a good idea to make that these kinds of functions work in-place. Also, the idea of normalizing in this manner is to take the Tensor that is not in either left nor right canonical form (the one in centersite), get its norm (since it is the one that contains the weights), and normalize by this value the entire Chain.

[Todorbsc]

Check the changes. I am not sure if I have to do something else other than normalizing the centersite tensor. Doing it this way, the complete Chain is normalized because the weights are concentrated in the centersite tensor. Let me know :)

[mofeing]

You're having a format problem. Please install JuliaFormatter and run format(".") on the project directory.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.55%. Comparing base (11890f0) to head (31b8c29).
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   75.00%   73.55%   -1.45%     
==========================================
  Files           8        8              
  Lines         436      450      +14     
==========================================
+ Hits          327      331       +4     
- Misses        109      119      +10     

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