Provide WLS models using auxiliary image

[galiacheng]

The WLS offer provides WLS models by:

• Building the basic model files into Application Image.
• Specify model file for DB configuration with ConfigMap.

This issue is to refactor the offer, and provides WLS models using auxiliary image.

For more information, see https://oracle.github.io/weblogic-kubernetes-operator/managing-domains/model-in-image/auxiliary-images/

Auxiliary images are the recommended best approach for including Model in Image model files, application archive files, and the WebLogic Deploy Tooling installation, in your pods. This feature eliminates the need to provide these files in the image specified in domain.spec.image.

[edburns]

Hi @galiacheng, Reza and I discussed this. We do believe this is appropriate for investment in Dilithium. See https://dev.azure.com/weblogic-azure/Open%20Standard%20Enterprise%20Java%20(Java%20EE)%20on%20Azure/_workitems/edit/343 .