Add benchmarks

This is almost entirely different from the original in #164. Instead it:

- uses benchmark.js rather than implementing our own
- mostly defers to benchmark.js stats logic for reporting
- skips `@actions/core` for generating the GitHub Actions summary, it wasn't really doing a lot for us

.github/workflows/npmjs.yml

@@ -28,6 +28,7 @@ jobs:
             - if: steps.cache.outputs.cache-hit != 'true'
               run: npm ci
             - run: npm test
+            - run: npm run benchmarks
             - if: github.event_name == 'release' && github.event.action == 'published' && matrix.node == '16'
               run: npm publish
               env:

package.json

@@ -29,6 +29,7 @@
     },
     "contributors": [],
     "scripts": {
+        "benchmarks": "vite-node ./test/benchmarks.ts",
         "build": "vite build && npm run tsc",
         "start": "vite",
         "eslint-check": "eslint app.ts src/**/*.ts vite.config.ts test/**/*.ts",
@@ -65,13 +66,15 @@
     },
     "devDependencies": {
         "@prettier/plugin-xml": "^2.2.0",
+        "@types/benchmark": "^2.1.2",
         "@types/css.escape": "^1.5.0",
         "@types/express": "^4.17.14",
         "@types/node": "^18.11.17",
         "@types/prettier": "^2.7.2",
         "@typescript-eslint/eslint-plugin": "^5.47.0",
         "@typescript-eslint/parser": "^5.47.0",
         "@vitest/coverage-istanbul": "^0.26.2",
+        "benchmark": "^2.1.4",
         "chai": "^4.3.7",
         "chai-as-promised": "^7.1.1",
         "docdash": "^1.2.0",
@@ -91,10 +94,12 @@
         "http-server": "^13.1.0",
         "istanbul-reporter-shield-badge": "^1.2.1",
         "markdown-eslint-parser": "^1.2.1",
+        "microtime": "^3.1.1",
         "pretty-format": "^29.3.1",
         "rimraf": "^3.0.2",
         "typescript": "^4.9.4",
         "vite": "^4.0.3",
+        "vite-node": "^0.28.4",
         "vite-plugin-node": "^1.0.0",
         "vitest": "^0.26.2"
     },