test: add benchmark

package-lock.json

@@ -329,6 +329,12 @@
         "lodash": "^4.17.11"
       }
     },
+    "@types/benchmark": {
+      "version": "1.0.31",
+      "resolved": "https://registry.npmjs.org/@types/benchmark/-/benchmark-1.0.31.tgz",
+      "integrity": "sha512-F6fVNOkGEkSdo/19yWYOwVKGvzbTeWkR/XQYBKtGBQ9oGRjBN9f/L4aJI4sDcVPJO58Y1CJZN8va9V2BhrZapA==",
+      "dev": true
+    },
     "@types/body-parser": {
       "version": "1.17.0",
       "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.17.0.tgz",
@@ -884,6 +890,16 @@
       "integrity": "sha512-zyPgY5dgbf99c0uGUjhY4w+mxqEGxPKg9RQDl34VvrVh2bM31lFN+mwR1ZHepq/KA3VCPk1gwJZL6IIJqjLy2w==",
       "dev": true
     },
+    "benchmark": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/benchmark/-/benchmark-2.1.4.tgz",
+      "integrity": "sha1-CfPeMckWQl1JjMLuVloOvzwqVik=",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.4",
+        "platform": "^1.3.3"
+      }
+    },
     "body-parser": {
       "version": "1.18.3",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
@@ -8734,6 +8750,12 @@
         "find-up": "^2.1.0"
       }
     },
+    "platform": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/platform/-/platform-1.3.5.tgz",
+      "integrity": "sha512-TuvHS8AOIZNAlE77WUDiR4rySV/VMptyMfcfeoMgs4P8apaZM3JrnbzBiixKUv+XR6i+BXrQh8WAnjaSPFO65Q==",
+      "dev": true
+    },
     "pn": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/pn/-/pn-1.1.0.tgz",