refactor: split basic-io module into a module for each method

[rossiam]

The main purpose of this change is to make writing pre-built mocks for the functions in the basic-io module (which are used a lot) easier.

Also includes lots of little refactors (I'm sure I missed some of these but this is a good start and I didn't touch files I wasn't touching already anyway):

• added type to lots of imports
• changed .toHaveBeenCalledTimes(0) to .not.toHaveBeenCalled()
• changed .toHaveBeenCalledTimes(1) paired with .toHaveBeenCalledWith to toHaveBeenCalledExactlyOnceWith
• reformatted lines to fit within 100 character limit

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Latest commit: dac14df457558cb0d7551bc0b63a512f12549d59

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