feat(dgeni,daffio): render package API doc exports

[griest024]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/graycoreio/daffodil/blob/develop/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Fixes: #2816, fixes: #2971

What is the new behavior?

• generates package docs as JSON
• handles API package docs specially in the doc viewer
• extracts the API list children to a separate component for use with API package docs

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[xelaint]

@griest024 I also need to make updates to the UI of list items in the api list. LMK when I can do that.

[griest024]

@xelaint you can go ahead and make UI updates

[xelaint]

@griest024 Is there a way to pull this section of the readme and add it to the page?

[griest024]

@griest024 Is there a way to pull this section of the readme and add it to the page?

hm yeah, technically. I think this is better pulled from the package.json description field.