Feature/pdct 1368 add the ability to read in all relevant data files

[odrakes-cpr]

What's changed?

Adds a function that reads json and csv files passed to the cli (these are very basic and just simply reads these files)
Adds in relevant tests

Proposed version

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[linear]

PDCT-1368 Add the ability to read in all relevant data files

[katybaulch]

Great start - think some of the things we've got as click commands can probably just be straightforward functions though :)

[katybaulch]

Nice work! Some of the docstrings are missing param and return descriptions, and I think it would be best to rename the files in your test_fixtures directory to be more meaningful. Shout if you need a hand or want to walk through it together :)

[katybaulch]

Good progress - have added some comments for review

[katybaulch]

nice one!!! let's get this in 😁