Apply stale rebot (#3150)

* Add issues management robot

.github/stale.yml

@@ -0,0 +1,33 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 30
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 20
+
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - "contribution welcome"
+  - "good first issue"
+  - "discussion"
+  - "bug"
+
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: true
+
+# Limit to only `issues` or `pulls`
+only: issues
+
+# Label to use when marking an issue as stale
+staleLabel: wait for feedback
+
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it hasn't had any recent activity.
+  If you think this should still be open, or the problem still persists,
+  just pop a reply in the comments and one of the maintainers will (try!) to follow up.
+  Thank you for your interest and contribution to the Sping Cloud Alibaba Community.
+
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: true
+
+# Limit the number of actions per hour, from 1-30. Default is 30
+limitPerRun: 10