SNOW-1524258: Implement GCM encryption

[sfc-gh-dheyman]

Description

SNOW-1524258: Implement GCM encryption

Checklist

• Format code according to the existing code style (run npm run lint:check -- CHANGED_FILES and fix problems in changed code)
• Create tests which fail without the change (if possible)
• Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• Extend the README / documentation and ensure is properly displayed (if necessary)
• Provide JIRA issue id (if possible) or GitHub issue id in commit message

[codecov]

Codecov Report

Attention: Patch coverage is 95.27559% with 6 lines in your changes missing coverage. Please review.

Project coverage is 88.90%. Comparing base (c4e6edb) to head (6ab4372).

Files with missing lines	Patch %	Lines
lib/file_transfer_agent/encrypt_util.js	95.27%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #966      +/-   ##
==========================================
- Coverage   88.91%   88.90%   -0.02%     
==========================================
  Files          69       69              
  Lines        6685     6748      +63     
==========================================
+ Hits         5944     5999      +55     
- Misses        741      749       +8     

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