feat: Add a Github Action that automatically closes stale PRs. (#2626)

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

@@ -0,0 +1,22 @@
+name: Close inactive pull requests
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v5
+        with:
+          days-before-pr-stale: 14
+          days-before-pr-close: 3
+          stale-pr-message: "This PR has not seen any activity in the past 2 weeks; if no one comments or reviews it in the next 3 days, this PR will be closed."
+          close-pr-message: "This PR was closed because it has been inactive for 17 days, 3 days since being marked as stale. Please re-open if you still need this to be addressed."
+          stale-pr-label: "stale"
+          close-pr-label: "autoclosed"
+          exempt-draft-pr: true
+          repo-token: ${{ secrets.GITHUB_TOKEN }}