Add mode that injects jaxb-runtime support classes next to generated classes

1. Sharing implementation of ToStringStrategy and other jaxb-runtime support classes provides consistency across model projects.

2. Storing the support classes in a shared dependency creates a tight-coupling runtime between modules.

3. By injecting the support classes next to the generated classes, each model project has their own implementation.

This enables large projects that have dozens of model jars to be incrementally upgraded in terms of runtime support classes. Also, this supports creating a single jar for all model classes which is more useful for 3rd party platforms such as SaaS, iPaaS, serverless, etc to consume jaxb generated classes as data models to be used in integrations and data mapping projects.