[skip-changelog] Add profiles to LoadSketchResponse

[MatteoPologruto]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
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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?

gRPC code enhancement

What is the new behavior?

Informations on profiles (name, fqbn, required platforms and libraries) can be retrieved through the LoadSketchResponse.

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

No

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% 🎉

Comparison is base (38479dc) 62.93% compared to head (3a06f96) 62.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2264      +/-   ##
==========================================
+ Coverage   62.93%   62.98%   +0.05%     
==========================================
  Files         221      221              
  Lines       19730    19746      +16     
==========================================
+ Hits        12418    12438      +20     
+ Misses       6209     6206       -3     
+ Partials     1103     1102       -1     

Flag	Coverage Δ
unit	62.98% <100.00%> (+0.05%)	⬆️

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

Files Changed	Coverage Δ
commands/sketch/load.go	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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