Adding Functionality to Store Lines of Plots

[afroch]

Summary

This pull request introduces the following changes

• Adding possibility to write out the lines of a plot into a pickle file which can be later loaded to avoid re-running calculations.

Conformity

• Changelog entry
• Documentation

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 30 lines in your changes missing coverage. Please review.

Project coverage is 97.67%. Comparing base (e830a25) to head (93d9b39).

Files with missing lines	Patch %	Lines
puma/histogram.py	46.15%	7 Missing ⚠️
puma/roc.py	65.00%	7 Missing ⚠️
puma/line_plot_2d.py	45.45%	6 Missing ⚠️
puma/var_vs_var.py	68.42%	6 Missing ⚠️
puma/plot_base.py	42.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #314      +/-   ##
==========================================
- Coverage   98.14%   97.67%   -0.47%     
==========================================
  Files          53       53              
  Lines        5710     5768      +58     
==========================================
+ Hits         5604     5634      +30     
- Misses        106      134      +28     

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[afroch]

Is superseeded by #319