CON-11810 Implement GetNodePoolTemplate endpoint for DOKS godo client

[dylanrhysscott]

Extends the godo public client with new method GetNodePoolTemplate which will be used in assisting CA to scale back up from zero. Created a test project with the following code to verify response is returned as expected

package main

import (
	"context"
	"encoding/json"
	"fmt"
	"github.com/digitalocean/godo"
	"log"
	"os"
)

func main() {
	t := os.Getenv("DIGITALOCEAN_ACCESS_TOKEN")
	if t == "" {
		log.Fatal("no DO token set")
	}
	client := godo.NewFromToken(t)
	tmpl, _, err := client.Kubernetes.GetNodePoolTemplate(context.TODO(), "<some-cluster-uuid>", "<some-node-pool-name>")
	if err != nil {
		log.Fatalf("failed to get template %s", err)
	}
	j, err := json.MarshalIndent(tmpl, "", "   ")
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(string(j))
}

Running the code results in the following response

{
   "cluster_uuid": "<some-cluster-uuid>",
   "name": "<some-node-pool-name>",
   "slug": "s-2vcpu-4gb",
   "template": {
      "capacity": {
         "cpu": 2,
         "memory": "4096Mi",
         "pods": 110
      },
      "allocatable": {
         "cpu": 1390,
         "memory": "2560Mi",
         "pods": 110
      }
   }
}

[m3co-code]

LGTM

[andrewsomething]

👍 LGTM