add benchmarking of matcher

bench.js

@@ -0,0 +1,71 @@
+const fs = require("fs");
+const turf = require("@turf/turf");
+const shst = require("sharedstreets");
+const tripMatch = require("./src/matchers/trip");
+const changeMatch = require("./src/matchers/change");
+const config = require("./test/fixtures/cli/config.json");
+const cover = require("@mapbox/tile-cover");
+
+const z = 19;
+const zs = { min_zoom: z, max_zoom: z };
+
+async function bench() {
+  config.zones.features = config.zones.features.map(zone => {
+    zone.properties.keys = {};
+    cover.indexes(zone.geometry, zs).forEach(key => {
+      zone.properties.keys[key] = 1;
+    });
+    return zone;
+  });
+
+  const envelope = turf.bboxPolygon(config.boundary).geometry;
+  const graphOpts = {
+    source: "osm/planet-181224",
+    tileHierarchy: 6
+  };
+  var graph = new shst.Graph(envelope, graphOpts);
+  await graph.buildGraph();
+
+  const trips = fs
+    .readFileSync("./example/data/Spuun/trips.json")
+    .toString()
+    .split("\n")
+    .filter(l => {
+      return l.length;
+    })
+    .map(JSON.parse);
+
+  const changes = fs
+    .readFileSync("./example/data/Spuun/changes.json")
+    .toString()
+    .split("\n")
+    .filter(l => {
+      return l.length;
+    })
+    .map(JSON.parse);
+
+  var start = new Date().getTime();
+
+  var count = 0
+
+  for (let trip of trips) {
+    count++
+    await tripMatch(trip, config, graph);
+  }
+
+  var stop = new Date().getTime();
+
+  console.log('trip match avg: ' + ((stop - start) / count).toFixed(4) + 'ms');
+  count = 0
+  start = new Date().getTime();
+
+  for (let change of changes) {
+    count++
+    await changeMatch(change, config, graph);
+  }
+
+  stop = new Date().getTime();
+  console.log('change match avg: ' + ((stop - start) / count).toFixed(4) + 'ms');
+}
+
+bench();