new attempt at clean PSB2 with five base problems

[IssaHanou]

Things to check in review:

• Using IntRule as type for Integer in the grammars.jl (because Integer and Int are both reserved in Julia)
• The command_while loop implementation in psb2_primitives.jl
• Are all the required links to the HerbAI framework in place?
• Is the README clear on how to add new tasks in the benchmark

TODO: testing individual grammar functions and the command_while

Includes problems:

• Basement
• Coinsums
• Fizz Buzz
• Fuelcost
• GCD

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.03315% with 47 lines in your changes missing coverage. Please review.

Please upload report for BASE (dev@b9afc1d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/data/PSB2_2021/retrieve_all_tasks.jl	0.00%	13 Missing ⚠️
src/data/PSB2_2021/PSB2_2021.jl	7.69%	12 Missing ⚠️
src/data/PSB2_2021/psb2_primitives.jl	63.63%	8 Missing ⚠️
src/data/PSB2_2021/program_examples.jl	78.12%	7 Missing ⚠️
src/utils/benchmarks_io.jl	0.00%	4 Missing ⚠️
src/data/PSB2_2021/base_grammars.jl	0.00%	1 Missing ⚠️
src/data/PSB2_2021/grammar.jl	98.94%	1 Missing ⚠️
src/data/PSB2_2021/problem_grammars.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             dev      #60   +/-   ##
======================================
  Coverage       ?   55.37%           
======================================
  Files          ?       28           
  Lines          ?      791           
  Branches       ?        0           
======================================
  Hits           ?      438           
  Misses         ?      353           
  Partials       ?        0           

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