chore: split $.each into $.each_keyed/$.each_indexed

[trueadm]

With Svelte 5, we load both each block reconciliation functions, making it impossible to tree shake one or the other if you don't use them. This PR changes that, ensuring we can treeshake them respectfully by breaking the compiled function into either $.each_keyed or $.each_indexed.

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🦋 Changeset detected

Latest commit: 6d50b22

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[dummdidumm]

Further below on line 2411 it's always doing reconcile_indexed_array, so treeshaking won't help when you're only using keyed each. Does it need to be reconcile_indexed_array there or can it use the passed in function, too?