public-ip-assignment support for sks nodepool

[arthuraliiev]

Description

Checklist

(For exoscale contributors)

• Changelog updated (under Unreleased block)
• Testing

Testing

go run main.go compute sks nodepool add fw test-nodepool
 ✔ Adding Nodepool "test-nodepool"... 39s
┼─────────────────────────┼─────────────────────────────────────────────────────────┼
│      SKS NODEPOOL       │                                                         │
┼─────────────────────────┼─────────────────────────────────────────────────────────┼
│ ID                      │ 9cb2ec2e-3df2-4b77-b748-e9dc1e2ad8f4                    │
│ Name                    │ test-nodepool                                           │
│ Description             │                                                         │
│ Public IP Assignment    │ inet4                                                   │
│ Creation Date           │ 2025-12-30 15:22:04 +0000 UTC                           │
│ Instance Pool ID        │ 1e137f61-3f14-40cf-94d8-d316c2cf1b7b                    │
│ Instance Prefix         │ pool                                                    │
│ Instance Type           │ standard.medium                                         │
│ Template                │ sks-node-1.34.3-standard                                │
│ Disk Size               │ 50                                                      │
│ IPv6                    │ false                                                   │
│ Anti Affinity Groups    │ n/a                                                     │
│ Security Groups         │ sks-cluster-calico-a0b6518d-50a2-4d54-8a5c-2e0ff3831547 │
│ Private Networks        │ n/a                                                     │
│ Version                 │ 1.34.1                                                  │
│ Size                    │ 2                                                       │
│ State                   │ running                                                 │
│ Taints                  │ n/a                                                     │
│ Labels                  │ n/a                                                     │
│ Add Ons                 │ n/a                                                     │
│ Image GC Min            │ 2m                                                      │
│ Image Gc Low Threshold  │ 80                                                      │
│ Image Gc High Threshold │ 85                                                      │
┼─────────────────────────┼─────────────────────────────────────────────────────────┼