Add 'toAsyncIterableScan' static method to 'VercelKV'

[rustworthy]

• Adding 'toAsyncIterableScan' private helper method, and re-using its logic across scan operations;
• Adding a test for 'hscanIterator', checking it's async iterable :)

No public contract changes.

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Latest commit: bbf55dd65b452a2eced48b1f21bb27af71a75b23

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