[WIP]Fix json structure of pg_settings data

[dmius]

    "localhost": [
      {
        "allow_system_table_mods": {
          "name": "allow_system_table_mods",
          "setting": "off",
          "unit": null,
          "category": "Developer Options",
          "short_desc": "Allows modifications of the structure of system tables.",
          "extra_desc": null,
          "context": "postmaster",
          "vartype": "bool",
          "source": "default",
          "min_val": null,
          "max_val": null,
          "enumvals": null,
          "boot_val": "off",
          "reset_val": "off",
          "sourcefile": null,
          "sourceline": null,
          "pending_restart": false
        }
      },
      {
        "application_name": {
          "name": "application_name",
          "setting": "psql",...```