[FEAT] Add members field to API docs

[griest024]

💡 Feature request

Feature Name

Add members field to API docs

The Desired Behavior

I would like relevant API docs (classes, interfaces, etc.) to contain a list of all member data (methods and props) such that daffio can render them.

Your Use Case

As a daffodil maintainer, I'd like daffio to render members split up.

Prior Work

The figma design