Improve copy implementation for adjoint handling

[lkdvos]

Enhance the copy! function to better manage the copying of values in AbstractBlockTensorMap, ensuring more efficient handling of adjoint cases.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.12%. Comparing base (063bdd7) to head (21dd54c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   55.87%   56.12%   +0.24%     
==========================================
  Files          18       18              
  Lines        1396     1397       +1     
==========================================
+ Hits          780      784       +4     
+ Misses        616      613       -3     

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