ISPN-14766 Introduce server overview report

[fax4ever]

The initial work to provide the report for #10929

[fax4ever]

@tristantarrant I added this little change to your commit to publish the ServerManagment from server runtime module => ISPN-14766 Register the server with the global registry.
Is it OK for you?

[fax4ever]

@tristantarrant with this PR we're going to introduce and expose as a REST entry-point the overview report + other little stuff required by the Insights Integration. I would like to merge it as soon as we have fully reviewed it. The idea is that we don't need to wait for the Insights integration to be fully tested to have it in our code base.

[fax4ever]

Here is an example of an overview report:

{
  "version": "1.0.0",
  "node-id": "cbfbba06-b7c7-401b-8d91-544865b27f14",
  "coordinator-id": "cbfbba06-b7c7-401b-8d91-544865b27f14",
  "cluster-name": "LON-1-city-hub",
  "cluster-size": 2,
  "cluster-members": [
    "cbfbba06-b7c7-401b-8d91-544865b27f14",
    "ace610c8-9e64-465d-b178-aeeb627d3689"
  ],
  "number-of-caches": 2,
  "cache-features": {
    "indexed": 1,
    "no-features": 1
  },
  "cache-configurations": [
    "invalid",
    "defaultcache"
  ],
  "local-site": "LON-1",
  "relay-node": true,
  "sites-view": [
    "LON-1", "SF-7"
  ],
  "memory": {
    "available": 17735016,
    "max": 1073741824,
    "total": 73400320,
    "used": 55665304
  },
  "cpu": {
    "system-load-average": 1.62939453125,
    "process-cpu-load": 0.0,
    "process-cpu-time": 1.3336052E10
  },
  "thread": {
    "count": 57,
    "daemon-count": 27,
    "max-count": 57,
    "total-started": 58
  },
  "proto-schemas": 3,
  "cache-stores": [
    "dummy-store"
  ],
  "used-encodings": [
    "application/octet-stream",
    "text/plain"
  ],
  "clients": {
    "Memcached": {},
    "SinglePort": {
      "protocol-versions": [
        "HTTP/1.1",
        "HOTROD/3.1"
      ],
      "client-library-names": [
        "Infinispan/15.0.0-SNAPSHOT"
      ]
    }
  },
  "security": {
    "security-realms": {
      "default": {
        "server-ssl": true,
        "client-ssl": true
      }
    },
    "tls-endpoints": []
  }
}

[fax4ever]

I'm closing it, since that it seems that at this point we can merge the complete contribution #10929.