Support specifying ingress class in Kong addon

[randmonkey]

Is there an existing issue for this?

• [x] I have searched the existing issues

Problem Statement

Currently the kong addon in KTF can only use the kong ingress class. We want to support installing Kong for different ingress classes.

Proposed Solution

Add a WithIngressClass method in kong add on to set ingress class.

Additional information

No response

Acceptance Criteria

• [ ] Can specify ingress class by Kong addon to install Kong in the cluster.