chore(svelte-virtual): update svelte examples to use svelte 5

[rayrw]

In this PR, I'm updating almost all Svelte examples to use Svelte 5, based on this finding. The only exception is the table example, as I'm not yet familiar with the changes in TanStack Table Svelte v9.

Please let me know if there is a better approach to use it in Svelte 5.

[changeset-bot[bot]]

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Latest commit: 1f6305fdca99c4fd526323be29f52b95c3d877b8

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