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/components/Chain/Header.tsx

@@ -28,6 +28,7 @@ import listIcon from '../../icons/list-alt-regular.svg';
 import worldIcon from '../../icons/location.svg';
 import settingsIcon from '../../icons/settings.svg';
 import consensusIcon from '../../icons/cube-alt.svg';
+import statsIcon from '../../icons/graph.svg';
 
 import './Header.css';
 
@@ -90,6 +91,14 @@ export class Header extends React.Component<Header.Props, {}> {
             current={currentTab}
             setDisplay={setDisplay}
           />
+          <Tab
+            icon={statsIcon}
+            label="Stats"
+            display="stats"
+            tab="stats"
+            current={currentTab}
+            setDisplay={setDisplay}
+          />
           <Tab
             icon={settingsIcon}
             label="Settings"