debug: Allow type-specification of JSON output for cortex-debug

[cmaglie]

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What kind of change does this PR introduce?

In the cortex-debug section of the debug info, all the values are converted by default to a string in the resulting JSON.
Now, If another type is needed, the value can be prefixed with the tags [boolean], [number], or [object] to force a specific type in the JSON, for example:

debug.cortex-debug.custom.aBoolean=[boolean]true
debug.cortex-debug.custom.anNumber=[number]10
debug.cortex-debug.custom.anotherNumber=[number]10.20
debug.cortex-debug.custom.anObject=[object]{"key":"value", "boolean":true}

will result in the following JSON:

{
  "aBoolean": true,
  "anNumber": 10,
  "anotherNumber": 10.2,
  "anObject": {
    "boolean": true,
    "key": "value"
  }
}

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

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (ef72bde) 64.48% compared to head (80fec99) 64.51%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2393      +/-   ##
==========================================
+ Coverage   64.48%   64.51%   +0.03%     
==========================================
  Files         207      207              
  Lines       19592    19630      +38     
==========================================
+ Hits        12633    12665      +32     
- Misses       5867     5871       +4     
- Partials     1092     1094       +2     

Flag	Coverage Δ
unit	64.51% <95.08%> (+0.03%)	⬆️

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Files	Coverage Δ
commands/debug/debug_info.go	71.70% <95.08%> (+4.64%)	⬆️

... and 1 file with indirect coverage changes

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[kittaakos]

Will this work with arrays? If yes, please update the example in the PR description. Thanks!

I am going to use this version downstream: arduino/vscode-arduino-tools#41.

[cmaglie]

I've upgraded the conversion process, now it can:

• build JSON object via properties hierarchy
• allow any type in array elements (even other arrays recursively)

This change should make it possible to build any JSON from properties.

[cmaglie]

@kittaakos I've cherrypicked this PR in the 0.35.x branch.