[Task] Add regression tests for session-based models

[bschifferer]

Description

We want to add a CI test, that collects metrics to understand if performance changes between releases.

First step:

• Add regression tests for session based transformer model https://github.com/NVIDIA-Merlin/models/blob/main/examples/usecases/transformers-next-item-prediction.ipynb

@radekosmulski shared ideas on it here: https://nvidia.slack.com/archives/CVBDJUPEZ/p1679617586380369

We will collect:

• Runtime NVTabular
• Runtime Training Model with TensorFlow
• NDCG Performance of Session-based model

I close other tickets related to it:

• https://github.com/NVIDIA-Merlin/Merlin/issues/223 : I think that is solved based on sample PR)
• https://github.com/NVIDIA-Merlin/Merlin/issues/233 : We changed priority to session-based models