Buffer channels

[TheTeaCat]

• Adds buffers to channels used by the proxy server to capture events & lambda responses
• Adds some more debug logs for the captured event & lambda response
• Adds some more debug logs for important env vars to more easily verify correct configuration

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.49%. Comparing base (0d6b19d) to head (41c1561).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   85.37%   85.49%   +0.12%     
==========================================
  Files          18       18              
  Lines         581      586       +5     
==========================================
+ Hits          496      501       +5     
  Misses         70       70              
  Partials       15       15              

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