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`

backend/telemetry_core/src/state/node.rs

@@ -17,7 +17,8 @@
 use crate::find_location;
 use common::node_message::SystemInterval;
 use common::node_types::{
-    Block, BlockDetails, NodeDetails, NodeHardware, NodeIO, NodeLocation, NodeStats, Timestamp,
+    Block, BlockDetails, NodeDetails, NodeHardware, NodeHwBench, NodeIO, NodeLocation, NodeStats,
+    Timestamp,
 };
 use common::time;
 
@@ -47,6 +48,8 @@ pub struct Node {
     stale: bool,
     /// Unix timestamp for when node started up (falls back to connection time)
     startup_time: Option<Timestamp>,
+    /// Hardware benchmark results for the node
+    hwbench: Option<NodeHwBench>,
 }
 
 impl Node {
@@ -67,6 +70,7 @@ impl Node {
             location: None,
             stale: false,
             startup_time,
+            hwbench: None,
         }
     }
 
@@ -110,6 +114,14 @@ impl Node {
         &self.best
     }
 
+    pub fn hwbench(&self) -> Option<&NodeHwBench> {
+        self.hwbench.as_ref()
+    }
+
+    pub fn update_hwbench(&mut self, hwbench: NodeHwBench) -> Option<NodeHwBench> {
+        self.hwbench.replace(hwbench)
+    }
+
     pub fn update_block(&mut self, block: Block) -> bool {
         if block.height > self.best.block.height {
             self.stale = false;