Add connector health information into healt check endpoint

[3keyroman]

Add information about the connector status from their health check endpoints into the health information.

The information about the connectors can be structured in this proposed way:

{
  "connectors": [
    {
      "name": "test"
      "health":
        {
          "status": "ok",
          "description": "string",
          "parts": {
            "property1": {},
            "property2": {}
          }
        }
    }
  ]
}