[Plugin] Helper functions for StructuredDatasets and FlyteFiles in Papermill Plugin

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Use Case

A common use-case for the papermill plugin could be automatically generating notebook reports at the end of modeling / etl pipelines. Having a notebook is useful because a Data Scientist can download it and inspect results further. The alternative is much harder.

Problem

Unfortunately, Papermill's inputs are limited, which makes it difficult to get data and files from Flyte into the notebooks. It requires a few extra tasks.

Idea

Providing helper functions that work with common data types like StructuredDataset, FlyteDirectory, and FlyteFiles.

It could be an inputs version of record_outputs, although serializing into json might difficult. See https://github.com/flyteorg/flytekit/blob/master/plugins/flytekit-papermill/flytekitplugins/papermill/task.py#L294.

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Here is an idea: https://gist.github.com/peridotml/8e3f4d303d117280cd0c9be8fc84f7c3.