Feature: Add cloud file upload

[cortadocodes]

Contents

New Features

• Add ability to upload/download files to/from Google Cloud
• Add option to upload serialised data to Google Cloud in Analysis.finalise

Minor improvements and fixes

• Pass GCP project and bucket names to tests from environment

Notes

• There's something weird going on with copy.deepcopy that fails unexpectedly in the python3.6 tests - @thclark any ideas? This PR hasn't touched that part of the code as far as I can see

Quality Checklist

• New features are fully tested (No matter how much Coverage Karma you have)

[codecov-io]

Codecov Report

Merging #96 (869a77c) into release/0.1.9 (25da590) will increase coverage by 0.00%.
The diff coverage is 97.22%.

@@              Coverage Diff               @@
##           release/0.1.9      #96   +/-   ##
==============================================
  Coverage          96.36%   96.36%           
==============================================
  Files                 51       52    +1     
  Lines               1100     1129   +29     
==============================================
+ Hits                1060     1088   +28     
- Misses                40       41    +1     

Impacted Files	Coverage Δ
octue/utils/cloud/credentials.py	80.00% <ø> (ø)
octue/resources/analysis.py	97.91% <90.00%> (-2.09%)	⬇️
.../resources/communication/google_pub_sub/service.py	100.00% <100.00%> (ø)
octue/utils/cloud/persistence.py	100.00% <100.00%> (ø)

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