moved expectation function and mic changes

[TL231]

Changed test to work with the move, and updated pyscf version.
Added a .codecov.yml file incase there's any need to change coverage report.
Slight change to the formatting of test.yml to what others used since it was the only one in "" for whatever reason.

[codecov]

Codecov Report

Patch coverage: 87.50% and project coverage change: +1.72% 🎉

Comparison is base (c81b5c5) 36.19% compared to head (8ce7282) 37.92%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
+ Coverage   36.19%   37.92%   +1.72%     
==========================================
  Files           8        8              
  Lines         442      443       +1     
==========================================
+ Hits          160      168       +8     
+ Misses        282      275       -7     

Flag	Coverage Δ
unittests	37.92% <87.50%> (+1.72%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/qibochem/driver/molecule.py	49.00% <ø> (-1.25%)	⬇️
src/qibochem/measurement/expectation.py	27.02% <87.50%> (+27.02%)	⬆️

... and 1 file with indirect coverage changes

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[TL231]

Side note, code coverage is poor, so I'll write up some simple tests to improve it.

[chmwzc]

Looks good, thanks!