Add function-based slot support to Astro.slots.render()

[natemoo-re]

Changes

• Previously, Astro.slots.render("default") could only render Astro components.
• Now, Astro.slots.render("default", [...args]) can render a function child, passing args into the function correctly.
• This allows users to build more ergonomic utility components like For.

<For each={items}>
  {(item) => <li>{item}</li>}
</For>

Testing

Test suite added for Astro.slots.render('default') and Astro.slots.render('default', [args])

Docs

TBD

[changeset-bot]

🦋 Changeset detected

Latest commit: a6519ff

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
astro	Patch

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[aFuzzyBear]

THIS IS AMAZING!!!
sorry bit carried away there lol