Command hex format

[Lagrang3]

Added json outputs to gl-cli commands.

For example:

$ glcli --json node getinfo
{
  "address": [],
  "alias": "...",
  "binding": [],
  "blockheight": 949533,
  "color": "...",
  "fees_collected_msat": 0,
  "id": "...",
  "lightning_dir": "/tmp/bitcoin",
  "network": "bitcoin",
  "num_active_channels": 0,
  "num_inactive_channels": 0,
  "num_peers": 1,
  "num_pending_channels": 0,
  "our_features": {
    "channel": "",
    "init": "0898880a8a59a1",
    "invoice": "02000002024100",
    "node": "8898880a8a59a1"
  },
  "version": "v25.12gl1"
}

I did this by hand, for every possible gRPC response that we use, which are not all of CLN's commands.
I know this is not ideal, since we have no guarantee of correctedness by developer error or API changes and
as the number of gRPC commands grow this task becomes tedious.
But right now it is manageable and until we find a trick to make it automatic we can use this.