chore: add stale bot workflow

.github/workflows/stale.yml

@@ -0,0 +1,29 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 6 * * *'
+  workflow_dispatch:
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v9
+        with:
+          days-before-stale: 90
+          days-before-close: 14
+          exempt-issue-labels: 'Type: Feature Request'
+          stale-issue-message: 'This issue has been marked as stale due to no activity in the last 90 days. It will be closed in 14 days if no further activity occurs.'
+          stale-pr-message: 'This pull request has been marked as stale due to no activity in the last 90 days. It will be closed in 14 days if no further activity occurs.'
+          close-issue-message: 'Closing this issue as it has been stale for 14 days.'
+          close-pr-message: 'Closing this pull request as it has been stale for 14 days.'
+          stale-issue-label: 'stale'
+          stale-pr-label: 'stale'
+          operations-per-run: 30
+          remove-issue-stale-when-updated: true
+          remove-pr-stale-when-updated: true
+          exempt-issue-author: 'dependabot[bot]'
+          exempt-pr-author: 'dependabot[bot]'