vine: dask arg worker_transfers

[JinZhou5042]

Proposed Changes

While calling DaskVine get API, we have two arguments for the same purpose, worker_transfers and lazy_transfers, the later one is marked as deprecated.

The default value for both is True. If the users want to activate it, they may pass

• worker_transfers=True
• lazy_transfers=True
• worker_transfers=True, lazy_transfers=True

This works well. However, if they want to deactivate it, they may pass

• worker_transfers=False
• lazy_transfers=False
• worker_transfers=False, lazy_transfers=False

Only the last works, because worker_transfers or lazy_transfers is always True if only one argument is explicitly passed by the users.

This PR changes the logic to - if one of the two arguments is False, then self.worker_transfers is False, otherwise True.

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