🌱 adding gzip content support

[grokspawn]

This is an inexpensive-to-implement approach which takes no action (and incurs no cost) unless:

1. the served content exceeds (a default) size of 1400 bytes; and
2. the client indicates support for compressed streaming via request header "Accept-Encoding" set to "gzip"

It's possible that we may decide later to trade CPU load for disk space, once we get an opportunity to generate some benchmarks with this approach.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.12%. Comparing base (c0ed3fa) to head (7443661).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #293   +/-   ##
=======================================
  Coverage   33.12%   33.12%           
=======================================
  Files          15       15           
  Lines         646      646           
=======================================
  Hits          214      214           
  Misses        411      411           
  Partials       21       21           

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[grokspawn]

Found a more concise (and general) test approach, plus realized I'd omitted the status == 200 test accidentally. 🐑-ish

[tmshort]

/lgtm