Add stale issue workflow

.github/workflows/close-stale-prs.yml

@@ -0,0 +1,18 @@
+name: 'Close stale issues and PR'
+on:
+  schedule:
+    - cron: '45 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-pr-message: 'This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          close-pr-message: 'This PR was closed because it has been stalled for 5 days with no activity.'
+          close-pr-label: '🧶 stale'
+          days-before-stale: 30
+          days-before-close: 5
+          days-before-pr-close: -1