ci: add release-please for automatic versioning

Sync package.json version to v1.5.0 and add release-please GitHub Action
to automate version bumps based on conventional commits.

.github/workflows/release-please.yml

@@ -0,0 +1,18 @@
+name: Release Please
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        with:
+          release-type: node