Change board list output sorting

[silvanocerza]

Please check if the PR fulfills these requirements

• 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)

• What kind of change does this PR introduce?

Enhances an existing feature.

• What is the current behavior?

Calling board list returns detected boards attached to a port in an unsorted and non determistic way.
This might happen when multiple boards with identical VID:PID combination are found in the currently installed Platforms.
This is an example output:

{
  "address": "/dev/cu.usbmodem14201",
  "protocol": "serial",
  "protocol_label": "Serial Port (USB)",
  "boards": [
    {
      "name": "Arduboy",
      "fqbn": "arduboy-homemade:avr:arduboy",
      "vid": "0x2341",
      "pid": "0x8036"
    },
    {
      "name": "Arduboy DevKit",
      "fqbn": "arduboy-homemade:avr:arduboy-devkit",
      "vid": "0x2341",
      "pid": "0x8036"
    },
    {
      "name": "Homemade Arduboy",
      "fqbn": "arduboy-homemade:avr:arduboy-homemade",
      "vid": "0x2341",
      "pid": "0x8036"
    },
    {
      "name": "Arduino Leonardo",
      "fqbn": "arduino:avr:leonardo",
      "vid": "0x2341",
      "pid": "0x8036"
    },
  ]
}

• What is the new behavior?

Calling board list command now returns the detected boards sorted by FQBN alphabetically, Arduino boards are always shown before all the others.

This also affects the gRPC interface.

Example output:

{
  "address": "/dev/cu.usbmodem14201",
  "protocol": "serial",
  "protocol_label": "Serial Port (USB)",
  "boards": [
    {
      "name": "Arduino Leonardo",
      "fqbn": "arduino:avr:leonardo",
      "vid": "0x2341",
      "pid": "0x8036"
    },
    {
      "name": "Arduboy",
      "fqbn": "arduboy-homemade:avr:arduboy",
      "vid": "0x2341",
      "pid": "0x8036"
    },
    {
      "name": "Arduboy DevKit",
      "fqbn": "arduboy-homemade:avr:arduboy-devkit",
      "vid": "0x2341",
      "pid": "0x8036"
    },
    {
      "name": "Homemade Arduboy",
      "fqbn": "arduboy-homemade:avr:arduboy-homemade",
      "vid": "0x2341",
      "pid": "0x8036"
    }
  ]
}

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

Nope.

• Other information:

None.

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