--port option is missing from usage of the firewall {add,delete}-rule commands

[jooola]

TL;DR

The --port flag is missing from the hcloud firewall add-rule and hcloud firewall delete-rule commands.

I don't know if this is expected, are only required flags part of the usage?

Expected behavior

That the --port flag is also part of the command usage.

Observed behavior

$ hcloud firewall add-rule --help
Add a single rule to a firewall

Usage:
  hcloud firewall add-rule [options] (--direction in --source-ips <ips> | --direction out --destination-ips <ips>) --protocol <icmp|udp|tcp|esp|gre> <firewall>

Flags:
      --description string            Description of the firewall rule
      --destination-ips stringArray   Destination IPs (CIDR Notation) (required when direction is out)
      --direction string              Direction (in, out) (required)
  -h, --help                          help for add-rule
      --port string                   Port to which traffic will be allowed, only applicable for protocols TCP and UDP, you can specify port ranges, sample: 80-85
      --protocol string               Protocol (icmp, esp, gre, udp or tcp) (required)
      --source-ips stringArray        Source IPs (CIDR Notation) (required when direction is in)

Minimal working example

$ hcloud firewall add-rule --help
$ hcloud firewall delete-rule --help

Log output

No response

Additional information

No response

[apricote]

I think this was missed because --port is not a globally required flag, only when using --protocol <tcp|udp> it becomes required.

---

While testing this, I also found that we do not print the invalid_input details. Which would help users in case our local validation is missing something:

--- Response:
{
  "error": {
    "message": "invalid input in field 'rules'",
    "code": "invalid_input",
    "details": {
      "fields": [
        {
          "name": "rules.port",
          "messages": [
            "tcp and udp protocols requires the port parameter to be specified"
          ]
        }
      ]
    }
  }
}

--- CLI Output:
hcloud: invalid input in field 'rules' (invalid_input)

[apricote]

Fixed by #734 and #735.