Adding the feature support in the channels info

[vincenzopalazzo]

With the listeners we can have information about all the node, and this mean that we could use better the listpers and void stupid pinging around the code.

A json example can be

  {
         "id": "0242a4ae0c5bef18048fbecf995094b74bfb0f7391418d71ed394784373f41e4f3",
         "connected": true,
         "netaddr": [
            "3.124.63.44:9735"
         ],
         "features": "0252a1",
         "channels": [
            {
               "state": "CHANNELD_NORMAL",
               "scratch_txid": "eb5d7ba111d58a7296e83a873e743ec9e9d105b02d9f370490fa0a0862f0411a",
               "last_tx_fee_msat": "184000msat",
               "feerate": {
                  "perkw": 253,
                  "perkb": 1012
               },
               "owner": "channeld",
               "short_channel_id": "697850x2450x0",
               "direction": 1,
               "channel_id": "903a0a085bb5e0d94f64517d21cdcc5564cbde882e38d62c5af88dfb8eedeb6b",
               "funding_txid": "6bebed8efb8df85a2cd6382e88decb6455cccd217d51644fd9e0b55b080a3a90",
               "close_to_addr": "bc1qgmt7mrjpeqrn4f67chfyxtsvgtsxrpjeh7f326",
               "close_to": "001446d7ed8e41c8073aa75ec5d2432e0c42e0618659",
               "private": false,
               "opener": "local",
               "features": [
                  "option_static_remotekey"
               ],
               "funding": {
                  "local_msat": "234857000msat",
                  "remote_msat": "0msat"
               },
               "msatoshi_to_us": 184849898,
               "to_us_msat": "184849898msat",
               "msatoshi_to_us_min": 184849898,
               "min_to_us_msat": "184849898msat",
               "msatoshi_to_us_max": 234857000,
               "max_to_us_msat": "234857000msat",
               "msatoshi_total": 234857000,
               "total_msat": "234857000msat",
               "fee_base_msat": "0msat",
               "fee_proportional_millionths": 2000,
               "dust_limit_satoshis": 546,
               "dust_limit_msat": "546000msat",
               "max_htlc_value_in_flight_msat": 18446744073709551615,
               "max_total_htlc_in_msat": "18446744073709551615msat",
               "their_channel_reserve_satoshis": 2348,
               "their_reserve_msat": "2348000msat",
               "our_channel_reserve_satoshis": 2348,
               "our_reserve_msat": "2348000msat",
               "spendable_msatoshi": 181961898,
               "spendable_msat": "181961898msat",
               "receivable_msatoshi": 47659102,
               "receivable_msat": "47659102msat",
               "htlc_minimum_msat": 0,
               "minimum_htlc_in_msat": "0msat",
               "their_to_self_delay": 144,
               "our_to_self_delay": 144,
               "max_accepted_htlcs": 30,
               "state_changes": [
                  {
                     "timestamp": "2021-08-27T16:15:58.497Z",
                     "old_state": "CHANNELD_AWAITING_LOCKIN",
                     "new_state": "CHANNELD_NORMAL",
                     "cause": "user",
                     "message": "Lockin complete"
                  }
               ],
               "status": [
                  "CHANNELD_NORMAL:Reconnected, and reestablished.",
                  "CHANNELD_NORMAL:Funding transaction locked. Channel announced."
               ],
               "in_payments_offered": 0,
               "in_msatoshi_offered": 0,
               "in_offered_msat": "0msat",
               "in_payments_fulfilled": 0,
               "in_msatoshi_fulfilled": 0,
               "in_fulfilled_msat": "0msat",
               "out_payments_offered": 1,
               "out_msatoshi_offered": 50007102,
               "out_offered_msat": "50007102msat",
               "out_payments_fulfilled": 1,
               "out_msatoshi_fulfilled": 50007102,
               "out_fulfilled_msat": "50007102msat",
               "htlcs": []
            }
         ]
      },