feat: JMH benchmarks added

.github/workflows/benchmarks.yml

@@ -0,0 +1,51 @@
+name: Benchmarks
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 3 * * 1'
+  push:
+    branches:
+      - main
+    paths:
+      - 'src/main/**'
+      - 'src/jmh/**'
+      - 'build.gradle'
+      - 'gradle/**'
+      - 'gradlew'
+      - 'gradlew.bat'
+      - '.github/workflows/benchmarks.yml'
+
+jobs:
+  jmh:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Check out sources
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+          cache: gradle
+
+      - name: Make Gradle executable
+        run: chmod +x ./gradlew
+
+      - name: Run JMH benchmarks
+        run: ./gradlew clean jmh --no-daemon
+
+      - name: Upload JMH reports
+        uses: actions/upload-artifact@v4
+        with:
+          name: jmh-reports
+          path: |
+            build/reports/jmh/**
+            build/results/jmh/**
+          if-no-files-found: warn