add references

[aloctavodia]

closes #303

• ppa add dictionary option for reference values
• predictive_finder add references values.

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (7f1707f) 79.70% compared to head (095d256) 80.09%.

Files	Patch %	Lines
preliz/predictive/predictive_finder.py	40.00%	3 Missing ⚠️
preliz/internal/plot_helper.py	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   79.70%   80.09%   +0.38%     
==========================================
  Files          34       34              
  Lines        4139     4164      +25     
==========================================
+ Hits         3299     3335      +36     
+ Misses        840      829      -11     

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