provide preprocess script to generate from k8s swagger.json

[amyXia1994]

Feature Request

Is your feature request related to a problem? Please describe:
related to #42

Describe the feature you'd like:

Before generate, there are some pre-process needed:
such as marking the group-version-kind to constants on k8s top models, add x-kcl-type information to provide the package/module info.

We should provide open sourced and tooled pre-process script, so that users can generate kcl packages on their own as needed and keep it consistent.

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: