e2e: add testcases for the cors wasmplugin

[Hinsteny]

Why do you need it?

use e2e test framework to testing cors wasmplugin

How could it be?

• ceate e2e test files, include cors.yaml and cors.go.
• execute test commond PLUGIN_NAME=cors make ingress-wasmplugin-test

Other related information

https://github.com/alibaba/higress/tree/main/plugins/wasm-go/extensions/cors

[onenewcode]

I'm familiar with http, go, but I haven't used k8s before, but I still want to contribute

[johnlanni]

@onenewcode Is there any progress on this?