new feature: torch dataset

[eroell]

Introduce the binned time-series of ehrdata.r as a pytorch dataset, streamed directly from the RDBMS without needing to load this potentially large datastructure into memory at any point

Tensor Dataset

• New class ehrdata.tl.EHRDataset, subclassing pytorch dataset
• Notebook for how to use EHRDataset
• Basic tests

Misc

• Construct .t in setup_variables and setup_interval_variables directly from RDBMS
• Construct .var in setup_variables and setup_interval_variables directly from RDBMS
• Unit checks in in setup_variables directly from RDBMS
• Add tests for unit checks

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