feat: nested collection support

[nwidynski]

Closes #7277 (comment)

As discussed, this change focuses only on the bare minimum to get nested collections to work.

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[nwidynski]

Not sure, why were we casting here?

[LFDanLu]

@nwidynski Heya, sorry about the delay, we were pretty busy with getting the release out. As mentioned in #7277 (comment) we are leaning towards supporting inputs in Gridlist first via something like #7360, which you had already noted doesn't solve the typeahead collision problem.

However, instead of making typeahead disable-able via a prop, we tossed around an idea of perhaps just doing some detection in the useTypeselect hook to see if the user was typing in an input and simply early return at that point. Any thoughts on that approach?