[Big deprecation] Introduces a `DataLoaderConfig` (#2441)
* Deprecate and introduce dataloader_config
* Update docs
* Doc nits
* More tests, adjust based on PR review
* Fixup tests
* Nits
* Update docs/source/quicktour.md
Co-authored-by: Benjamin Bossan <BenjaminBossan@users.noreply.github.com>
* Clean
* Actually create one
* Forgot to change one
* Use pytest
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Co-authored-by: Benjamin Bossan <BenjaminBossan@users.noreply.github.com>
