Operator for minimising the variance

[alleSini99]

Operator for minimising the variance <O^2> - <O>^2 of an arbitrary operator O.
@PhilipVinc

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (f282aab) 82.55% compared to head (b2e5e0e) 82.75%.
Report is 7 commits behind head on master.

Files	Patch %	Lines
...erimental/observable/variance/variance_operator.py	77.77%	6 Missing ⚠️
netket/experimental/observable/variance/exact.py	89.47%	2 Missing and 2 partials ⚠️
netket/experimental/observable/variance/expect.py	90.90%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1687      +/-   ##
==========================================
+ Coverage   82.55%   82.75%   +0.19%     
==========================================
  Files         293      302       +9     
  Lines       18050    18364     +314     
  Branches     3482     3545      +63     
==========================================
+ Hits        14902    15197     +295     
- Misses       2472     2480       +8     
- Partials      676      687      +11     

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