Update RPC frormat about channels in up_time

[vincenzopalazzo]

The JSON propriety in the up_time payload about "channels": is unclear. It reports only the number and not the information about the status. I would like to move it on the json object with nodeid and status.

like

{
   "node_id": "0000000",
   "state":  "CHANNELD_AWAITING_LOCKIN",
}

[vincenzopalazzo]

The new format is reported below:

{
   "channels_info": {},
   "color": "02bf81",
   "metric_name": "metric_one",
   "node_id": "033904095f082d5fe8ff8d7ee96172e69f166f1b498ccfd3a1e4e5d139d1fad597",
   "os_info": {
      "architecture": "x86_64",
      "os": "Linux Mint",
      "version": "20.1 (Ulyssa)"
   },
   "timezone": "CEST",
   "up_time": [
      {
         "channels": {
            "summary": [],
            "tot_channels": 0
         },
         "event": "on_start",
         "forwards": {
            "completed": 0,
            "failed": 0
         },
         "timestamp": 1627742938
      }
   ]
}