Refactor providers into separate libraries #1190
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Details: Add a DML DeviceInterface and DML DeviceBuffer handler. Remove #if blocks that are doing memory copies between device/cpu memory and use the DeviceSpan interface.
Remove as many #if USE_CUDA/USE_DML as possible
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This removes most of the #if USE_CUDA and #if USE_DML blocks for the model handling code. Device memory management is also handled through the DeviceSpan structure and now all data copying is done in a device independent manner.
It's a huge change, and there will be some rough edges when submitted. Goal is to unblock other people needing the changes and then to make larger improvements in future prs.