optimize converter to TensorMap

[lkdvos]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.39%. Comparing base (2a85190) to head (e3f8cf7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/tensors/abstractblocktensor/conversion.jl	83.33%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   54.02%   54.39%   +0.36%     
==========================================
  Files          17       17              
  Lines        1440     1445       +5     
==========================================
+ Hits          778      786       +8     
+ Misses        662      659       -3     

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