Core: Handle v3 index in composition

[tmeasday]

What I did

• Get types passing again in a couple test files I looked at (looks like TS got stricter 👍 )
• Rationalize refs code a little bit (it was confusing that it was calling different things stories in different places).
• Ensure we handle v3 story index files loaded via refs, in particular WRT docs entries.

How to test

Compose a 6.x Storybook into one of the example apps.

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[shilman]

@tmeasday this one is not building. maybe i resolved merge conflicts incorrectly?

[shilman]

I'm a little fuzzy on the TypeScript changes for Module. @ndelangen can you please take a look also?

[tmeasday]

@shilman with the changes to using stricter typescript rules, the tests weren't happy with the looseness of the Module type. I tightened it up a little bit. I don't think it's super controversial but equally I'm happy to adjust if @ndelangen has different ideas.