ci: setup release-please automation for automated versioning

- Added release-please GitHub Action workflow to automate release PR creation.
- Configured release-please-config.json to target Gradle build files for automated version bumping.
- Initialized .release-please-manifest.json at version 2.0.0.

Author: Mirkoddd

.github/workflows/release-please.yml

@@ -0,0 +1,17 @@
+name: Release Please
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Run Release Please
+        uses: googleapis/release-please-action@v4

.release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+  ".": "2.0.0"
+}

release-please-config.json

@@ -0,0 +1,16 @@
+{
+  "packages": {
+    ".": {
+      "release-type": "simple",
+      "extra-files": [
+        {
+          "type": "xml",
+          "path": "pom.xml",
+          "xpath": "/project/version"
+        },
+        "build.gradle",
+        "gradle.properties"
+      ]
+    }
+  }
+}