[docs]: Add GKE deployment guide

[syangx39]

This PR adds a step-by-step guide (gke-deployment-guide.md) for deploying the agent-sandbox controller and the Python runtime example on Google Kubernetes Engine (GKE).

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[janetkuo]

Suggest merging this with the README here
https://github.com/kubernetes-sigs/agent-sandbox/tree/main/examples/python-runtime-sandbox#testing-on-a-local-kind-cluster-using-agent-sandbox

[aditya-shantanu]

This is a GKE example. Should we keep this under GKE ?
I think we'll eventually move this to GKE docs but this is a good start to add here.

[aditya-shantanu]

/approve

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This pull-request has been approved by: aditya-shantanu, syangx39
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