introduce to_dataframe in order to avoid memory peaks in IO

[FabianHofmann]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02% 🎉

Comparison is base (4245a89) 86.96% compared to head (839eebb) 86.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #153      +/-   ##
==========================================
+ Coverage   86.96%   86.98%   +0.02%     
==========================================
  Files          14       14              
  Lines        3114     3120       +6     
  Branches      710      711       +1     
==========================================
+ Hits         2708     2714       +6     
  Misses        296      296              
  Partials      110      110              

Files Changed	Coverage Δ
linopy/common.py	91.13% <100.00%> (+0.23%)	⬆️
linopy/constraints.py	88.14% <100.00%> (ø)
linopy/expressions.py	87.50% <100.00%> (ø)
linopy/variables.py	90.75% <100.00%> (ø)

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