fix: support gzip-encoded responses from the server

[ecordell]

Supports gzip encoding by delegating decompression to the underlying transport. There are two places we need to do this: in the write activity (which may get a compressed response in answer to a write) and in the reverse proxy director (which may read a compressed response)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.34%. Comparing base (067637c) to head (6abdf74).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
+ Coverage   69.30%   69.34%   +0.03%     
==========================================
  Files          27       27              
  Lines        2864     2867       +3     
==========================================
+ Hits         1985     1988       +3     
  Misses        623      623              
  Partials      256      256              

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[tstirrat15]

LGTM