Description:
We've recently added support for EndpointSlice, and current only support Static IPv4 Endpoint Addresses
We should also add support for FQDN address types
https://kubernetes.io/docs/concepts/services-networking/endpoint-slices/#address-types

[optional Relevant Links:]

• looks like no changes are needed in the gateway api layer

  gateway/internal/gatewayapi/route.go

  Line 1043 in 8f138f5

  for _, address := range endpoint.Addresses {

• in the xds translator layer, we'd need to detect whether the endpoint is a static address or FQDN and pass the right endpoint type (Static or DNS)

  gateway/internal/xds/translator/translator.go

  Line 219 in 8f138f5

  endpointType: Static,

• Above step may require splitting up endpoints in multiple clusters if we need to handle mix endpoints (some static and some DNS)