GCSToS3 functionality

[Fryyyyy]

This is the second of a number of PRs incoming that will deal with files in storage buckets across GCP and AWS

Please squash all the commits I literally have no idea what I'm doing with Git

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@5424266). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #296   +/-   ##
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  Coverage        ?   64.16%           
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  Files           ?       32           
  Lines           ?     2302           
  Branches        ?        0           
=======================================
  Hits            ?     1477           
  Misses          ?      825           
  Partials        ?        0           

Flag	Coverage Δ
nosetests	64.16% <0.00%> (?)

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