Add planner tests

[marcofavorito]

Proposed changes

Add tests that also run a planner over the compiled PDDL domain/problem, and check the solution found.

Fixes

Fix #246

Types of changes

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

• Bugfix (non-breaking change which fixes an issue)
• 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.

• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also, you should start your branch off our develop.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works

Further comments

n/a

[codecov]

Codecov Report

Merging #261 (d539ad9) into main (b4da5f3) will increase coverage by 0.18%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
+ Coverage   89.61%   89.79%   +0.18%     
==========================================
  Files          12       12              
  Lines         549      549              
==========================================
+ Hits          492      493       +1     
+ Misses         57       56       -1     

Flag	Coverage Δ
unittests	89.79% <ø> (+0.18%)	⬆️

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see 1 file with indirect coverage changes

[francescofuggitti]

Looks awesome, thanks!