Add per Node Hardware Information to Telemetry Feed (#519)

* code: Add `sysinfo` and `hwbench` to the `AddedNode` message

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* code: Update `AddedNode` on `hwbench` updates

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* core: Rename cli flag `expose_node_ips` to `expose_node_details`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* core: Add hardware info only if the cli flag is enabled

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* tests: Adjust testing to the new `AddedNode` message

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* core: Move serialization of fields to the details array

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

backend/telemetry_core/src/main.rs

@@ -82,9 +82,10 @@ struct Opts {
     /// How many nodes from third party chains are allowed to connect before we prevent connections from them.
     #[structopt(long, default_value = "1000")]
     max_third_party_nodes: usize,
-    /// Flag to expose the IP addresses of all connected nodes to the feed subscribers.
+    /// Flag to expose the node's details (IP address, SysInfo, HwBench) of all connected
+    /// nodes to the feed subscribers.
     #[structopt(long)]
-    pub expose_node_ips: bool,
+    pub expose_node_details: bool,
 }
 
 fn main() {
@@ -135,7 +136,7 @@ async fn start_server(num_aggregators: usize, opts: Opts) -> anyhow::Result<()>
             max_queue_len: aggregator_queue_len,
             denylist: opts.denylist,
             max_third_party_nodes: opts.max_third_party_nodes,
-            expose_node_ips: opts.expose_node_ips,
+            expose_node_details: opts.expose_node_details,
         },
     )
     .await?;