new chapter Services/optimisations

[networkop]

Endpoint slices

Topology-aware routing

traffic policy local

sessionAffinity

https://github.com/kubernetes/enhancements/blob/0e4d5df19d396511fe41ed0860b0ab9b96f46a2d/keps/sig-network/1507-app-protocol/README.md#risks-and-mitigations

anything else worth mentioning?