Add option to normalize gradient while training

[stecrotti]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.10%. Comparing base (ea59aa3) to head (d83165f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dmrg.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   97.19%   97.10%   -0.10%     
==========================================
  Files          13       13              
  Lines         999     1001       +2     
==========================================
+ Hits          971      972       +1     
- Misses         28       29       +1     

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