feat: use zstd instead of gzip for compression

[joseph-sentry]

• use zstandard compression in write_file
• if the content encoding is set to zstd, manually decompress the downloaded bytes using ztd
• remove logic from renaming content_type in read_file
• setup VCR in test_gcp to match on the body

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.84%. Comparing base (f408749) to head (9d5325c).
Report is 6 commits behind head on main.

❗ Current head 9d5325c differs from pull request most recent head 28c85d4

Please upload reports for the commit 28c85d4 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
- Coverage   90.33%   89.84%   -0.49%     
==========================================
  Files         383      324      -59     
  Lines       11713     9564    -2149     
  Branches     2052     1711     -341     
==========================================
- Hits        10581     8593    -1988     
+ Misses       1039      907     -132     
+ Partials       93       64      -29     

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