[Feature Request]: DSL for Low-Code

### What would you like to happen?

From my investigations of Hop over Beam, it appears to be a No-Code Workflow / Pipeline builder that requires use of a GUI.
Would be great to have a markup syntax that captures the steps that are generated as code - this would enable import/export, meta code generation and source control.

For reference, Apache Beam has a **YAML** API https://beam.apache.org/documentation/sdks/yaml/

### Issue Priority

Priority: 2

### Issue Component

Component: API

No files, tests, or implementation entry points are identified. Start by reviewing Hop's existing GUI-generated workflow steps and the Apache Beam YAML API referenced in the issue. Done would require a defined markup syntax that supports import/export, meta-code generation, and source control.

Written by the indexing model from the issue text.