support callback when VIP switched(switch hook)

[zhiqiangwang08]

when VIP switch to another host, run user's script(bash script or python script ...) through callback(hook).

• before_vip_change
• after_vip_change

something very similar to patroni's callbacks (on_role_change). Not sure if any plan to support such a feature.

Thanks

[pashagolub]

Hello.

Sounds like a good idea. Do you have a WIP patch maybe? Pull requests are more than welcome

Thanks

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