chore(ci): add standalone benchmark job

.github/workflows/benchmark.yml

@@ -0,0 +1,45 @@
+name: benchmark
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+# concurrency:
+#   group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number || github.sha }}
+#   cancel-in-progress: true
+
+env:
+  CARGO_INCREMENTAL: 0
+  CARGO_NET_RETRY: 10
+  CARGO_TERM_COLOR: always
+  RUSTUP_MAX_RETRIES: 10
+  PYTHON_VERSION: "3.12"
+
+jobs:
+  benchmarks:
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: "Checkout Branch"
+        uses: actions/checkout@v4
+
+      - name: "Install Rust toolchain"
+        run: rustup show
+
+      - name: "Install codspeed"
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-codspeed
+
+      - uses: Swatinem/rust-cache@v2
+
+      - name: "Build benchmarks"
+        run: cargo codspeed build --features codspeed -p bench
+
+      - name: "Run benchmarks"
+        uses: CodSpeedHQ/action@v2
+        with:
+          run: cargo codspeed run
+          token: ${{ secrets.CODSPEED_TOKEN }}