Seed fix and Metadata addition to sacc

[arthurmloureiro]

Ensure the seed leads to reproducible shifts and adds metadata to the concealed sacc file

To Do

• Add seed as a metadata to the saved sacc
• Include more metadata to the sacc file
• copy the original metadata to the sacc file
• test if the same seed yields the same shifts in different computers.
• include unit test coverage for the new metadata lines

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.44%. Comparing base (ac8dff5) to head (53ba5af).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   96.73%   98.44%   +1.70%     
==========================================
  Files           6        6              
  Lines         184      193       +9     
==========================================
+ Hits          178      190      +12     
+ Misses          6        3       -3     

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