Respect the order of menu, when computing the config options

[alessio-perugini]

Please check if the PR fulfills these requirements

See how to contribute

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• 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?

This will change the output sorting when calling the boards details.

What is the current behavior?

When launching the arduino-cli boards details -b esp8266:esp8266:generic --format json the order of the
config options doesn't follow the order of the menu declared in the first lines of boards.txt file.

What is the new behavior?

We now ensure that the order of the config options are following the order of the menus fields declared at the beginning of boards.txt

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

Nope

Other information

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.07 ⚠️

Comparison is base (2c2a5cc) 62.51% compared to head (0fbb88a) 62.45%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2159      +/-   ##
==========================================
- Coverage   62.51%   62.45%   -0.07%     
==========================================
  Files         224      224              
  Lines       19520    19646     +126     
==========================================
+ Hits        12203    12269      +66     
- Misses       6222     6279      +57     
- Partials     1095     1098       +3     

Flag	Coverage Δ
unit	62.45% <100.00%> (-0.07%)	⬇️

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

Impacted Files	Coverage Δ
arduino/cores/board.go	93.89% <100.00%> (+0.24%)	⬆️

... and 5 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[cmaglie]

Nice idea! I think we can improve it a bit, I left some comments.

IMHO this PR can be removed from the draft state.