Clarify Typescript types for MaplibreMap slot

[singingwolfboy]

Typescript was incorrectly detecting the type of the map prop in the <MaplibreMap> slot to be type maplibregl.Map | null. This is understandable, since that is the type of the store in the MapLibre.svelte file, but in order for the child components to be rendered, the store cannot be null. As a result, the type was too wide.

The Svelte documentation states that it's possible to override the detected types using some advanced typing systems. It notes that "The API is experimental and may change at any point," but for now, this seems to be the right way to accomplish this.

I don't know if this change should be considered "minor" or "patch" level; feel free to change the changeset, if you want!

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🦋 Changeset detected

Latest commit: 9dd50f9150e4664666661a65e5d15c1233577ce9

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

This PR includes changesets to release 1 package

| Name | Type | | --------------- | ----- | | svelte-maplibre | Minor |

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[dimfeld]

Released in v0.8.1