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It must be compatible with current kubernetes operator.

Whether

• [Nice-to-have] Move the flink-autoscaler to flink repo
  • It's easy to implement flink-yarn-sutoscaler after decoupling. And adding flink-yarn-sutoscaler to flink-kubernetes-operator repo is wired.
  • I prefer keeping this module in flink-kubernetes-operator repo during this FLIP, and we can move it in the last step of this FLIP.

Test Plan

UT & IT & Manually verify that the autoscaler is working as expected.

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