Description:

For now, the kubernetesYAMLToResources function in egctl x translate only able to process one GatewayClass, for multiple GC case, the translation will fail.

IMO, above function should return something like:

type LoadResources struct {
        Resources
        
        GatewayClasses  []*gwv1.GatewayClass
        EnvoyProxies    []*egv1a1.EnvoyProxy
}

• The GC and EP should be stored in list instead of variable
• Above function should be placed in gatewayapi layer (This will be super helpful for file-provider in standalone mode to reuse this logic to load all kinds of resources from file)

Any thoughts on this? cc @envoyproxy/gateway-maintainers

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