Use github actions/stale for managing stale issues/PRs (#2694)

.github/workflows/stale.yaml

@@ -0,0 +1,31 @@
+name: 'Close stale'
+on:
+  schedule:
+  - cron: '* * * * *' # Runs everyday
+
+jobs:
+  stale:
+    runs-on: 'ubuntu-latest'
+    steps:
+    - uses: 'actions/stale@v3'
+      with:
+        repo-token: '${{ secrets.GITHUB_TOKEN }}' # No need to setup
+
+        stale-issue-message: |-
+          This issue is stale because it has been open for 90 days with no
+          activity. It will automatically close after 30 more days of
+          inactivity. Reopen the issue with `/reopen`.Mark the issue as
+          fresh by adding the comment `/remove-lifecycle stale`.
+        stale-issue-label: 'lifecycle/stale'
+        exempt-issue-labels: 'lifecycle/frozen'
+
+        stale-pr-message: |-
+          This Pull Request is stale because it has been open for 90 days with
+          no activity. It will automatically close after 30 more days of
+          inactivity. Reopen with `/reopen`.Mark as fresh by adding the
+          comment `/remove-lifecycle stale`.
+        stale-pr-label: 'lifecycle/stale'
+        exempt-pr-labels: 'lifecycle/frozen'
+
+        days-before-stale: 90
+        days-before-close: 30