legacy: Builder refactorization (part 4...)

[alessio-perugini]

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• 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?

Refactoring of legacy

What is the current behavior?

What is the new behavior?

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

Other information

[codecov]

Codecov Report

Patch coverage: 82.13% and project coverage change: -0.06% ⚠️

Comparison is base (5e01a2e) 63.92% compared to head (2ad132c) 63.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2310      +/-   ##
==========================================
- Coverage   63.92%   63.87%   -0.06%     
==========================================
  Files         214      212       -2     
  Lines       19919    19874      -45     
==========================================
- Hits        12734    12694      -40     
+ Misses       6090     6089       -1     
+ Partials     1095     1091       -4     

Flag	Coverage Δ
unit	63.87% <82.13%> (-0.06%)	⬇️

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

Files Changed	Coverage Δ
arduino/builder/progress/progress.go	100.00% <ø> (ø)
legacy/builder/merge_sketch_with_bootloader.go	74.75% <0.00%> (ø)
legacy/builder/types/context.go	100.00% <ø> (+8.10%)	⬆️
arduino/builder/linker.go	79.51% <57.14%> (ø)
legacy/builder/recipe_runner.go	76.31% <60.00%> (ø)
arduino/builder/sizer/sizer.go	47.22% <64.86%> (ø)
arduino/builder/core.go	76.64% <76.29%> (-23.36%)	⬇️
arduino/builder/sketch.go	57.69% <81.25%> (+7.69%)	⬆️
arduino/builder/detector/detector.go	74.34% <81.81%> (-0.23%)	⬇️
arduino/builder/libraries.go	79.00% <90.90%> (ø)
... and 5 more

... and 1 file with indirect coverage changes

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