[Feature] - LB update timeout missing

[okdas]

Is your feature request related to a problem? Please describe.

Discovered in vultr/vultr-cloud-controller-manager#285.

vultr-cli is missing an option to update load balancer timeout:

~  ❯ vultr version
Vultr-CLI v3.4.0
~  ❯ vultr load-balancer update --help
Update a Load Balancer with the desired settings

Usage:
  vultr-cli load-balancer update <Load Balancer ID> [flags]

Aliases:
  update, u

Examples:

	# Full example
	vultr-cli load-balancer update 57539f6f-66a2-4580-936b-d0af934bce5d --label="Updated Load Balancer Label" \
		--balancing-algorithm="leastconn" --unhealthy-threshold=20

	#Shortened example with aliases
	vultr-cli lb u 57539f6f-66a2-4580-936b-d0af934bce5d -l="Updated Load Balancer Label" -b="leastconn" -u=20

	#Full example with attached VPC
	vultr-cli load-balancer update 57539f6f-66a2-4580-936b-d0af934bce5d --vpc="bff36707-977e-4357-8f30-bef3339155cc"


Flags:
  -b, --balancing-algorithm string     (optional) balancing algorithm that determines server selection | roundrobin or leastconn (default "roundrobin")
      --certificate string             (optional) the SSL certificate.
      --certificate-chain string       (optional) the certificate chain for a ssl certificate.
  -c, --check-interval int             (optional) interval between health checks.
      --cookie-name string             (optional) the cookie name to make sticky.
      --firewall-rules stringArray     (optional) a comma-separated, key-value pair list of firewall rules. Use - between each new rule.
                                       		E.g: "port:80,ip_type:v4,source:0.0.0.0/0-port:8080,ip_type:v4,source:1.1.1.1/4"
  -f, --forwarding-rules stringArray   (optional) a comma-separated, key-value pair list of forwarding rules. Use - between each new rule.
                                       		E.g: "frontend_port:80,frontend_protocol:http,backend_port:80,backend_protocol:http-frontend_port:81,
                                       		frontend_protocol:http,backend_port:81,backend_protocol:http"
      --healthy-threshold int          (optional) number times a check must succeed before returning to healthy status.
  -h, --help                           help for update
  -i, --instances strings              (optional) an array of instances IDs that you want attached to the load balancer.
  -l, --label string                   (optional) the label for your load balancer.
  -n, --nodes int                      (optional) The number of nodes to add to the load balancer (1-99), must be an odd number (default 1)
      --path string                    (optional) HTTP Path to check. only applies if protocol is HTTP or HTTPS.
      --port int                       (optional) the port to use for health checks.
      --private-key string             (optional) the private key component for a ssl certificate.
      --protocol string                (optional) the protocol to use for health checks. | https, http, tcp
  -p, --proxy-protocol                 (optional) if true, you must configure backend nodes to accept Proxy protocol.
  -t, --response-timeout int           (optional) timeout before health check fails.
  -s, --ssl-redirect                   (optional) if true, this will redirect HTTP traffic to HTTPS. You must have an HTTPS rule
                                       		and SSL certificate installed on the load balancer to enable this option.
  -u, --unhealthy-threshold int        (optional) number times a check must fail before becoming unhealthy.
  -v, --vpc string                     (optional) the VPC ID to attach to your load balancer.

Global Flags:
      --config string   config file (default is $HOME/.vultr-cli.yaml) (default "/Users/dk/.vultr-cli.yaml")
  -o, --output string   output format [ text | json | yaml ] (default "text")

Describe the solution you'd like

add a --timeout argument.

Describe alternatives you've considered

There's a workaround currently to update directly via an API:

curl "https://api.vultr.com/v2/load-balancers/${LB_UUID}" \
-X PATCH \
-H "Authorization: Bearer ${VULTR_API_KEY}" \
-H "Content-Type: application/json" \
--data '{
"timeout": 1800
}'