Override equal for derived predicates

[francescofuggitti]

Proposed changes

Add custon eq operator to Predicates and Derived Predicates

Types of changes

What types of changes does your code introduce? Put an x in the boxes that apply

• [x] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply.

• [x] I have read the CONTRIBUTING doc
• [x] Lint and unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works

[codecov-commenter]

Codecov Report

Merging #74 (173de51) into main (ad68c05) will decrease coverage by 0.08%. The diff coverage is 50.00%.

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@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
- Coverage   88.30%   88.23%   -0.08%     
==========================================
  Files          20       20              
  Lines        1052     1054       +2     
  Branches      164      164              
==========================================
+ Hits          929      930       +1     
- Misses         95       96       +1     
  Partials       28       28              

Flag	Coverage Δ
unittests	88.23% <50.00%> (-0.08%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pddl/logic/predicates.py	83.52% <50.00%> (-0.81%)	:arrow_down:

[haz]

codecov is not happy ;)