add integration by range for Cp2kCube class

[robinzyb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 3 lines in your changes missing coverage. Please review.

Project coverage is 46.33%. Comparing base (4a83a3d) to head (83fd6b4).
Report is 24 commits behind head on main.

Files	Patch %	Lines
cp2kdata/cell.py	91.66%	1 Missing ⚠️
cp2kdata/cube/cube.py	97.72%	1 Missing ⚠️
cp2kdata/log.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   45.01%   46.33%   +1.31%     
==========================================
  Files          32       32              
  Lines        1906     1951      +45     
==========================================
+ Hits          858      904      +46     
+ Misses       1048     1047       -1     

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