[WIP] convert create-user.sh to pure go functions

[9trocode]

The result of this code would look like this it generates ${tenant}-${user}.kubeconfig

{
  "apiVersion": "v1",
  "kind": "Config",
  "clusters": [
    {
      "name": "orbstack",
      "cluster": {
        "certificate-authority-data": "<data>",
        "server": "https://127.0.0.1:26443"
      }
    }
  ],
  "contexts": [
    {
      "name": "oil-oil",
      "context": {
        "cluster": "orbstack",
        "user": "oil"
      }
    }
  ],
  "current-context": "oil-oil",
  "preferences": null,
  "users": [
    {
      "name": "oil",
      "user": {
        "client-certificate-data": "<data>",
        "client-key-data": "<data>"
      }
    }
  ]
}

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[prometherion]

You can rely on the clientcmdapi.Config object: https://github.com/kubernetes/client-go/blob/8c4efe8d079e405329f314fb789a41ac6af101dc/tools/clientcmd/api/types.go#L28-L31

[9trocode]

So instead of defining my own types i could use the types for the k8 sdk

Nice will make some edits

[prometherion]

@9trocode I'm very welcoming to your PR, and I'd like to know if you could revamp it.

[github-actions]

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