DataTask Locality Considerations

[Keith-Bateman]

Is your feature request related to a problem? Please describe.
When executing a DataTask, it might be better to create multiple copies of data in order to improve locality of future accesses. This could also be performed during composition or scheduling, and it isn't immediately clear where the best place to replicate DataTasks is.

Describe the solution you'd like
Explore replication policies that can give improved locality, likely using an AI predictor to decide which data will be likely to be accessed in the future.