Quick-start for Ranking: Fix bug when saving model trained with single task and moved util classes to Models #967
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This PR fixes a bug that was occurring when trying to save a model trained for single-task learning.
It also extracts the following util classes from the Quick-Start scrips, which are added in #1085 to Merlin Models:
LogLossMetric
WandbLogger
ExamplesPerSecondCallback
Important: This PR can only be merged after #1085 is merged.