feat: add release-please workflow (#3)

This adds automated release management using Google's release-please action.
The workflow will:
- Create and maintain release PRs based on conventional commits
- Update package.json version on release
- Generate CHANGELOG.md
- Create GitHub releases when release PR is merged

Release-As: 1.0.0

Author: johnnyhuy

.github/workflows/release.yml

@@ -0,0 +1,19 @@
+name: Draft Release
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  draft:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          release-type: node