new feature (interpreted functions)

[Ezpeon]

Not supported:

• interpreted function in the problem goal

Untested:

• UserType as function output - might work but has not been tested
• conversion of partial order plans and STN plans with interpreted functions has not been tested

[codecov]

Codecov Report

Attention: Patch coverage is 96.11307% with 55 lines in your changes missing coverage. Please review.

Project coverage is 85.92%. Comparing base (7b1a737) to head (56cbda1).
Report is 19 commits behind head on master.

Files with missing lines	Patch %	Lines
...engines/compilers/interpreted_functions_remover.py	95.86%	18 Missing ⚠️
unified_planning/model/interpreted_function.py	90.24%	12 Missing ⚠️
..._planning/engines/interpreted_functions_planner.py	91.12%	11 Missing ⚠️
unified_planning/engines/compilers/utils.py	70.00%	3 Missing ⚠️
..._planning/model/walkers/usertype_fluents_walker.py	25.00%	3 Missing ⚠️
unified_planning/model/walkers/type_checker.py	77.77%	2 Missing ⚠️
unified_planning/shortcuts.py	50.00%	2 Missing ⚠️
unified_planning/model/expression.py	93.33%	1 Missing ⚠️
unified_planning/model/problem.py	93.33%	1 Missing ⚠️
unified_planning/model/walkers/names_extractor.py	50.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #626      +/-   ##
==========================================
+ Coverage   85.36%   85.92%   +0.55%     
==========================================
  Files         202      209       +7     
  Lines       27319    28726    +1407     
==========================================
+ Hits        23322    24682    +1360     
- Misses       3997     4044      +47     

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[alvalentini]

@Ezpeon I left a few comments