Make XPK Handle multiple slice sizes

[rwitten]

N queues, 1 per slice size, 1 cluster.

(This is complicated!)

[Obliviour]

From my understanding I believe this would be multiple resource flavors with their respective chip sizes still in 1 ClusterQueue. https://kubernetes.io/blog/2022/10/04/introducing-kueue/#example-use-case

[Obliviour]

maybe looks something like this:

xpk cluster create --cluster=my-cluster --tpu-types v5p-128,5 v5p-256,5   # type, num_slices

• make sure that cluster create when rerunning the command is aware of the heterogenousness of the cluster

[Obliviour]

One aspect to this is that the overall goal here is to allow the gke cluster to figure out the needed slice types based on a set of user provided options: chip-budget and what incoming requests are.

Probably can also set some minimum / starting points.