Enhance `debug -I` not encoding information in property name

[umbynos]

Current JSON output:

"cortex-debug_custom_configuration": {         <===
    "postAttachCommands": [
        ...
    ],
    "overrideRestartCommands": [
        ...
    ]
  },

New JSON output will be:

"custom_configuration": {
    "cortex-debug": {              <===
      "postAttachCommands": [
        ...
      ],
      "overrideRestartCommands": [
        ...
      ]
    }
  },

Separating cortex-debug_custom_configuration into custom_configuration.cortex-debug provides a better JSON structure. Not putting information inside the property name. This gives also a more robust system to platform dev allowing them to specify other custom_configuration object if they need to.