add codspeed integration

Author: anonrig

.github/workflows/codspeed.yml

@@ -0,0 +1,36 @@
+name: CodSpeed Benchmarks
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  # Allows CodSpeed to trigger backtest performance analysis
+  # in order to generate initial baseline data.
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  id-token: write # required for OIDC authentication with CodSpeed
+
+jobs:
+  benchmarks:
+    name: Run benchmarks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6.0.2
+
+      - name: Setup Rust toolchain, cache and cargo-codspeed
+        uses: moonrepo/setup-rust@v1.3.0
+        with:
+          channel: stable
+          cache-target: release
+          bins: cargo-codspeed
+
+      - name: Build benchmark targets
+        run: cargo codspeed build
+
+      - name: Run benchmarks
+        uses: CodSpeedHQ/action@v6.0.2
+        with:
+          run: cargo codspeed run