Instance Create: Migrate to egoscale v3 and add multiple sshkeys

[pierre-emmanuelJ]

Description

Checklist

(For exoscale contributors)

• Changelog updated (under Unreleased block)
• Testing

Testing

go run main.go c i create test-instance \ 
             -z de-fra-1 \
             --anti-affinity-group b2dbf427-251d-404e-83a4-ee804c9fcc04 \
             --cloud-init ~/cloud.yaml \
             --disk-size 100 \
             --instance-type standard.small \
             --ipv6 \
             --label test=toto \
             --private-network fbc1093c-53eb-46cf-a5b6-5cc4c7ac9cc4 \
             --security-group vpn \
             --ssh-key pierro777 \
             --ssh-key test1-1721039696 \
             --ssh-key test1-1721044660 \
             --template "Linux Debian 12 (Bookworm) 64-bit" \
             --template-visibility public

 ✔ Creating instance "test-instance"... 21s
┼──────────────────────┼──────────────────────────────────────┼
│   COMPUTE INSTANCE   │                                      │
┼──────────────────────┼──────────────────────────────────────┼
│ ID                   │ c1926e55-7bb9-4678-84aa-444e994c41bc │
│ Name                 │ test-instance                        │
│ Creation Date        │ 2024-07-24 09:16:24 +0000 UTC        │
│ Instance Type        │ standard.small                       │
│ Template             │ Linux Debian 12 (Bookworm) 64-bit    │
│ Zone                 │ de-fra-1                             │
│ Anti-Affinity Groups │ test                                 │
│ Deploy Target        │ -                                    │
│ Security Groups      │ vpn                                  │
│ Private Instance     │ No                                   │
│ Private Networks     │ test                                 │
│ Elastic IPs          │ n/a                                  │
│ IP Address           │ 89.145.161.94                        │
│ IPv6 Address         │ 2a04:c46:e00:82a1:473:88ff:fe00:12c  │
│ SSH Key              │ pierro777                            │
│ Disk Size            │ 100 GiB                              │
│ State                │ running                              │
│ Labels               │ test:toto                            │
│ Reverse DNS          │                                      │
┼──────────────────────┼──────────────────────────────────────┼

I made multiple test like that with all the flags, and private instance also has been tested, since it's slightly different.
I can confirm multiple ssh keys are working (pub keys are present on the instance). To show multiple ssh keys, instance show need to be adapted with egoscale v3 also, but will be done in another PR

[sauterp]

That's quite a lot of changes, how did you test it?

[pierre-emmanuelJ]

@kobajagi @sauterp description as been adapted accordingly to the performed test on the command.