Add gzip deserialization

[dimaryaz]

Automatically decompress gzip'ed package entries.

[codecov]

Codecov Report

Merging #2677 (3794f69) into master (bda772c) will increase coverage by 0.08%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master    #2677      +/-   ##
==========================================
+ Coverage   41.36%   41.45%   +0.08%     
==========================================
  Files         536      536              
  Lines       24751    24791      +40     
  Branches     3380     3380              
==========================================
+ Hits        10239    10276      +37     
- Misses      13739    13742       +3     
  Partials      773      773              

Flag	Coverage Δ
api-python	90.61% <92.85%> (+0.01%)	⬆️
catalog	13.20% <ø> (ø)
lambda	88.05% <ø> (ø)

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Impacted Files	Coverage Δ
api/python/quilt3/formats.py	81.68% <90.90%> (+0.79%)	⬆️
api/python/quilt3/packages.py	92.87% <100.00%> (+0.05%)	⬆️
api/python/tests/integration/test_packages.py	100.00% <100.00%> (ø)

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[akarve]

Looks good. I'm gonna test it today. Would you add a CHANGELOG entry and update docs?

[akarve]

Can we also do this? Apparently customer has both in S3.

Suggested change

	handled_extensions = ['gz']
	handled_extensions = ['gz', 'gzip']