break down saveCookies - saveToDisk concept

[mrWh1te]

Describe the bug
With the introduction of getCookies in #105 pr, there is an opportunity to revisit saveCookies to follow a more singular purpose in its implentation.

Concept
saveCookies concept using pipe(getCookies, saveToDisk)

Therefore needs a new dynamic function for writing a file of unknown file extension to local hard disk.

Spike
Design an implementation that is dynamic and singular for save filings to disk for a cleaner implementation of saveCookies.