Add bounding for OTLP response body

[fractalwrench]

Goal

Adds bounding so that only the first N bytes of a response body are read.

Closes #362

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.87%. Comparing base (6a91758) to head (a9ddd89).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...otlin/io/opentelemetry/kotlin/export/OtlpClient.kt	50.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #361   +/-   ##
=======================================
  Coverage   90.86%   90.87%           
=======================================
  Files         257      257           
  Lines        3209     3210    +1     
  Branches      355      355           
=======================================
+ Hits         2916     2917    +1     
  Misses        213      213           
  Partials       80       80           

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[martincostello]

Latest iteration of open-telemetry/opentelemetry-proto#781 is 4 * 1024 * 1024.

[bidetofevil]

Nice. LGTM