Add per-chain aggregate software/hardware telemetry (#464)

* Add per-chain aggregate software/hardware telemetry

* Fix tests' compilation

* Add extra comments for the `Counter` struct

* Replace the boolean argument with an enum

* Rename `replace_hwbench` to `update_hwbench`

* Move `Counter` into a separate file

* Move `ChainStatsCollator` to `chain_stats.rs`

* Fix incorrect key on the unknown table

* Improve types for the stats component; get rid of `any`

frontend/src/Connection.ts

@@ -362,6 +362,11 @@ export class Connection {
           break;
         }
 
+        case ACTIONS.ChainStatsUpdate: {
+          this.appUpdate({ chainStats: message.payload });
+          break;
+        }
+
         default: {
           break;
         }