EPIC - CNCF Serverless Workflow new DSL

[fjtirado]

This epic has been created to track all issues related with DSL changes on Serverless Workflow spec.

• Migration to new DSL (Specification 1.0.0) serverlessworkflow/sdk-java#359
• Add Print Task serverlessworkflow/specification#856
• Add schema validation  serverlessworkflow/sdk-java#370
• Change getAdditionalProperties by getName and getValue.  serverlessworkflow/sdk-java#380
• Automatically generate serializers and deserializers serverlessworkflow/sdk-java#379
• Support const keyword in generator serverlessworkflow/sdk-java#418
• oneOf is translated to Object when one of the options is a simple type.  serverlessworkflow/sdk-java#444
• Add pattern and format check for Strings in one/any/allOf  serverlessworkflow/sdk-java#449

[fjtirado]

SDK work completed.
Created EPIC for tracking work related with reference implementation serverlessworkflow/sdk-java#459