Add service type option to expose command

[takatea]

Hi!

This PR allows the ktunnel to support any service type when using expose command.

Specifically, the ALB only supports NodePort or LoadBalancer if it uses. Now I deal with the above problem by updating the service resource using kubectl edit command.

Therefore, I would like to optionally set the service type option when using the expose command.

Example

ktunnel expose myapp 80:8000 --service-type=NodePort

Ref:

• https://docs.aws.amazon.com/eks/latest/userguide/alb-ingress.html
• https://pkg.go.dev/k8s.io/api@v0.25.4/core/v1#ServiceSpec