NVTabular Updates to dfencoder

[jarmak-nv]

Overview

Given an input dataframe, dfencoder currently does the following 2 things: 1) Setup the dataframe schema based on the column types and values and 2) Build the structure of the auto encoder model from that schema. The schema should be replaced with NVTabular (most likely just the updates to morpheus.utils.column_info) and then build the model from the NVT schema.

Tasks

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1. NVTabular - Move dfencoder from it's own repository into Morpheus
2. NVTabular - Update DFEncoder data ingestion and ETL to use NVTabular #867
   dfp feature request +2
   
3. NVTabular - Update DFEncoder training loop to use NVTabular #868
   dfp feature request +2
   
4. NVTabular - Add tests to DFEncoder #869
   Priority 0 feature request +2