[Feat] Vertical Scaling of GameServer without restarting container

[chrisliu1995]

Kubernetes v1.27 introduces InPlacePodVerticalScaling feature-gate, which is very helpful for game servers.

We could involve this function to OKG, to help game servers being adjusted resources configuration by automatically or manually with players being not affected.

As we all know, GameServer record the game status of corresponding Pod. We need a complete solution to realize that:

1. Users can adjust resources by GameServer, and Pod will be executed the changing.
2. GameServer can recognize the change of Pod resources, and show those status on itself.

[Macroldj]

Reference

• Vertical Resources Scaling in Kubernetes architect
• 1287-in-place-update-pod-resources
• in-place-pod-resize-alpha