Add utility functions to easily extract values from metadata

[eliascarv]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 55 lines in your changes missing coverage. Please review.

Project coverage is 0.41%. Comparing base (5cd0186) to head (bb4643d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/userutils.jl	0.00%	51 Missing ⚠️
src/metadata.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main      #3      +/-   ##
========================================
- Coverage   0.52%   0.41%   -0.12%     
========================================
  Files          5       6       +1     
  Lines        191     242      +51     
========================================
  Hits           1       1              
- Misses       190     241      +51     

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