To make our release process easier, I plan to mark milestone
and label is required before the PR merged, they use for

* label: In this path we required label with at least on with
  'feature|bug|improvement|document|chore' to make our changelog
  more convenient
* milestone: For easier to cherry-pick PR, currently some of
  our milestone only exists in issue and not exists in related
  PR, it may

* Add label `Waiting for reply` to bug/feature label
avoid stale bot close

* Remove bot label-on-issue

We do not need this anymore, cause when issue is created
it would auto add label `waiting for reply` for now

* Change issue/pr stale and close days.

After this PR merged, issue would be close in 37 days
and PR will be close in 127 days.