[Feature Request]: Generate XML schema for pipelines and workflows

[mattcasters]

What would you like to happen?

It should be possible to generate XML schemas for Hop pipelines and workflows.
We have the rather simple metadata of pipelines and workflows.
The real issue is determining which elements the transforms and actions need.
I think it's possible to use the @HopMetadataProperty annotations to generate the <xs:element/> entries.

Issue Priority

Priority: 3

Issue Component

Component: API

[mattcasters]

Pre-requisite: move all transform and action serialization to using @HopMetadataProperty serialization.