Add index-level export for JoinedData, mark sourceLayer optional

[dimfeld]

Fixes #83

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Latest commit: cd0bbb7aae6b1997a190c961554d878a54787664

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| Name | Type | | --------------- | ----- | | svelte-maplibre | Patch |

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Name	Status	Preview	Comments	Updated (UTC)
svelte-maplibre	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 18, 2023 4:21am