Add YAML to feedback formats

[polldo]

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• Tests for the changes have been added (for bug fixes / features)
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• What kind of change does this PR introduce?

This pr enhances the feedback package by allowing to use also the YAML format.
For the YAML marshal It's been selected a YAML dependency already present in go.mod

• What is the current behavior?

• What is the new behavior?

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

• Other information:

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[umbynos]

Maybe could be useful to have also the completion for yaml?

arduino-cli/cli/cli.go

Line 119 in 9b6f769

validOutputFormats := []string{"text", "json", "jsonmini"}

[polldo]

the goal of this pr was just to improve the feedback package, without actually enable YAML support in arduino-cli (I don't know if you want this feature, we need it in the cloud-cli for extracting cloud templates from things and dashboards)

If you'd like arduino-cli to support yaml format I can make the necessary changes, just let me know 😄

[silvanocerza]

the goal of this pr was just to improve the feedback package, without actually enable YAML support in arduino-cli (I don't know if you want this feature, we need it in the cloud-cli for extracting cloud templates from things and dashboards)

If you'd like arduino-cli to support yaml format I can make the necessary changes, just let me know smile

Please do. 😄

[polldo]

Updated!

[silvanocerza]

Works nicely, good job! 👍

Feel free to merge as soon all checks pass.

The links check workflow is failing cause gnu.org seems down, ignore it.