FR: Propagate Batch Size to Data Science Pipeline

**Is your feature request related to a problem? Please describe.**
With the current setup it is not possible to pass the batch size to Optuna as the dataloader objects are being created in a different pipeline, prior to the training/ optuna pipeline.
Therefore this particular hyperparameter cannot tuned with Optuna.

**Describe the solution you'd like**
Create dataloader objects within the instructor and return pure data tensors from the data processing pipeline.

**Describe alternatives you've considered**
Create dataloader objects in a separate node and call this node in each optuna trial.

**Additional context**
N/A