Specify generic device is less secure

[polldo]

Motivation

Find a way to let the user know that generic devices are less secure than standard ones (with crypto)

Change description

Additional Notes

Reviewer checklist

• PR address a single concern.
• PR title and description are properly filled.
• Changes will be merged in main.
• Changes are covered by tests.
• Logging is meaningful in case of troubleshooting.
• History is clean, commit messages are meaningful (see CONTRIBUTING.md) and are well formatted.

[eclipse1985]

A couple of comments:

• I would change the help message even for the create subcommand since as a user I don't understand which is the difference between create and create-generic

Something like:

fabrizio@ ~ $ arduino-cloud-cli device
Device commands.

Usage:
  arduino-cloud-cli device [command]

Available Commands:
  create               Create a device provisioning the onboard secure element with a valid certificate
  create-generic       Create username and password credentials for a generic device without secure element - WARNING: less secure
  ...

• Fix the subcommand specific help as well

fabrizio@ ~ $ arduino-cloud-cli device create-generic --help
Create username and password credentials for a generic device without secure element - WARNING: less secure

Usage:
  arduino-cloud-cli device create-generic [flags]

Flags:
  -b, --fqbn string   Device fqbn (default "generic:generic:generic")
  -h, --help          help for create-generic
  -n, --name string   Device name

Global Flags:
      --format string   The output format, can be {text|json}. (default "text")
  -v, --verbose         Print the logs on the standard output.

[polldo]

@eclipse1985 thanks
is it more clear now?

I've put
Create a generic device with password authentication - without secure element - WARNING: less secure
instead of
Create username and password credentials for a generic device without secure element - WARNING: less secure
because it seems more consistent with the command, what do you think?