Updated ppa widgets to include references

[rohanbabbar04]

fixes #128

Description

• Updated ppa widgets to include references
• Updated ppa.gif

Checklist

• Code style is correct (follows pylint and black guidelines)
• Widget states have been properly saved (only for notebooks with widgets) see for details.

[aloctavodia]

can you add a picture or gif?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c82028a) 83.31% compared to head (7e051bc) 84.07%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #328      +/-   ##
==========================================
+ Coverage   83.31%   84.07%   +0.75%     
==========================================
  Files          36       37       +1     
  Lines        4244     4264      +20     
==========================================
+ Hits         3536     3585      +49     
+ Misses        708      679      -29     

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[rohanbabbar04]

The references can take int, float, tuple or values in csv format

[aloctavodia]

Alll functions that use references values accept, int float, tuple, list and dictionaries. Can we pass dictionaries with the text box? The keys are used as labels.

[rohanbabbar04]

Seems to work

It is not updated here for ppa(dictionary), we should do that as well

references : int, float, list or tuple
        Value(s) used as reference points representing prior knowledge. For example expected
        values or values that are considered extreme.

Should I update the docs in this PR itself?

[aloctavodia]

Great. Yes, the docstring is outdated.

[rohanbabbar04]

Great. Yes, the docstring is outdated.

Done, updated the docstring.