DLPipelines: deprecated in favor of FastAI.jl

DLPipelines.jl has been deprecated, and all of its functionality has been moved to FastAI.jl.

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DLPipelines.jl is an interface for defining deep learning data pipelines. This includes every data transformation beside the model itself: preprocessing and augmenting the data before feeding it into the model, and decoding the model's outputs to targets.

It is used in FastAI.jl to provide an easy-to-use interface for common learning tasks.

See the documentation for more information on implementing the interface.