[CI] Add dependabot support and labeler workflow (#162)

Add dependabot support and labeler workflow

---------

Signed-off-by: Yuanhao Ji <jiyuanhao@apache.org>

.github/workflows/labeler.yml

@@ -0,0 +1,18 @@
+name: Pull Request Labeler
+
+on: pull_request_target
+
+jobs:
+  label:
+    name: Label
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Label the PR
+        uses: actions/labeler@v5
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          configuration-path: .github/labeler.yml
+          sync-labels: true