[Offload] Introduce dataFence plugin interface. (#153793)

The purpose of this fence is to ensure that any `dataSubmit`s inserted
into a queue before a `dataFence` finish before finish before any
`dataSubmit`s
inserted after it begin.

This is a no-op for most queues, since they are in-order, and by design
any operations inserted into them occur in order.

But the interface is supposed to be functional for out-of-order queues.

The addition of the interface means that any operations that rely on
such ordering (like ATTACH map-type support in #149036) can invoke it,
without worrying about whether the underlying queue is in-order or
out-of-order.

Once a plugin supports out-of-order queues, the plugin can implement
this function, without requiring any change at the libomptarget level.

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Co-authored-by: Alex Duran <alejandro.duran@intel.com>

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