Add validation data support to flow fitting #3
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This PR adds the option to fit normalizing flows with validation data, as well as documentation and tests. This means showing the validation loss in the progress bar, optionally keeping the weights which yield the smallest validation loss, and to optionally stop fitting early after no improvement in validation loss for a specified number of epochs. The changes are showcased in a notebook. There is also support for conditional normalizing flows, i.e. fitting conditional on context data.