Extracted RESTWizard to javaee-api from javaee-impl.

This allows addons to stop depending on javaee-impl for this class.
Moved RestGenerationContext to javaee-api.

This is done to allow other addons to consume the
RestResourceGenerator API.
Extracted names of RestResourceGenerator as constants in javaee-api.
Extracted JPAFIeldOperations into an interface.