feat: added client-id information on getClusterNodes

[leafaar]

Problem

We need the Client-ID to use on validators.app

Summary of Changes

I made a simple modification where I'm using the Debug version output of Version, because it exposes the Client ID;

impl fmt::Debug for Version {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(
            f,
            "{}.{}.{} (src:{:08x}; feat:{}, client:{:?})",
            self.major,
            self.minor,
            self.patch,
            self.commit,
            self.feature_set,
            self.client(),
        )
    }
}

I didn't wanted to add a new parameter to the client-id because it would change the API for the getClusterNodes, so what you will receive now instead of the version is:
2.2.15 (src:00000000; feat:798020478, client:Agave)
instead of
2.2.15

It's easy to parse this, if you want to get the version just split based on the "(" and get the first part, then to get the version do the same but for "client:" and get second part.

here's what you going to see (I prettified the json, just to make easy to visualize.)

leafar@rafael-pc:~$ curl -X POST http://127.0.0.1:8899 \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getClusterNodes"
  }'

RESPONSE:

{
  "jsonrpc": "2.0",
  "result": [
    {
      "featureSet": 798020478,
      "gossip": "127.0.0.1:1024",
      "pubkey": "CEucL8UAsFZur9Ce57F7jM5hr7RVMY1KYwgbL5nQrbFE",
      "pubsub": "127.0.0.1:8900",
      "rpc": "127.0.0.1:8899",
      "serveRepair": "127.0.0.1:1036",
      "shredVersion": 46683,
      "tpu": "127.0.0.1:1027",
      "tpuForwards": "127.0.0.1:1028",
      "tpuForwardsQuic": "127.0.0.1:1034",
      "tpuQuic": "127.0.0.1:1033",
      "tpuVote": "127.0.0.1:1029",
      "tvu": "127.0.0.1:1025",
      "version": "2.2.15 (src:00000000; feat:798020478, client:Agave)"
    }
  ],
  "id": 1
}

[leafaar]

Here's the only thing I changed, the other things is my VS Code formatting things (I should disable)