legacy: Builder refactorization (part 2...)

[alessio-perugini]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

It should not produce visible user changes, it's a tentative factorization of the legacy arduino-builder code

What is the new behavior?

Does this PR introduce a breaking change, and is titled accordingly?

Other information

[codecov]

Codecov Report

Patch coverage: 81.60% and project coverage change: +0.44% 🎉

Comparison is base (1c110e9) 63.37% compared to head (f57fbeb) 63.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2298      +/-   ##
==========================================
+ Coverage   63.37%   63.82%   +0.44%     
==========================================
  Files         214      214              
  Lines       19551    19794     +243     
==========================================
+ Hits        12390    12633     +243     
+ Misses       6075     6074       -1     
- Partials     1086     1087       +1     

Flag	Coverage Δ
unit	63.82% <81.60%> (+0.44%)	⬆️

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

Files Changed	Coverage Δ
legacy/builder/create_cmake_rule.go	8.30% <0.00%> (ø)
legacy/builder/test/helper.go	100.00% <ø> (+20.83%)	⬆️
legacy/builder/types/context.go	91.37% <ø> (-2.67%)	⬇️
legacy/builder/phases/sizer.go	44.11% <41.66%> (-1.45%)	⬇️
...der/wipeout_build_path_if_build_options_changed.go	78.84% <50.00%> (ø)
commands/compile/compile.go	71.42% <60.00%> (+0.08%)	⬆️
legacy/builder/phases/linker.go	80.23% <71.79%> (-2.05%)	⬇️
arduino/builder/utils/utils.go	76.49% <80.00%> (+7.64%)	⬆️
legacy/builder/phases/core_builder.go	77.77% <86.56%> (+6.22%)	⬆️
legacy/builder/phases/libraries_builder.go	80.37% <89.79%> (+4.05%)	⬆️
... and 7 more

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