WIP - Benchmarks

[hdost]

Relates to #808

[codecov]

Codecov Report

Merging #816 (cd0ae68) into main (1f84f4a) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main    #816   +/-   ##
=====================================
  Coverage   69.7%   69.8%           
=====================================
  Files        110     110           
  Lines       9061    9072   +11     
=====================================
+ Hits        6324    6339   +15     
+ Misses      2737    2733    -4     

Impacted Files	Coverage Δ
opentelemetry-datadog/src/exporter/model/v03.rs	85.4% <0.0%> (-1.6%)	⬇️
opentelemetry-datadog/src/exporter/model/v05.rs	82.3% <0.0%> (-1.6%)	⬇️
opentelemetry-sdk/src/trace/span_processor.rs	79.7% <0.0%> (-0.1%)	⬇️
opentelemetry-http/src/lib.rs	12.2% <0.0%> (ø)
opentelemetry-jaeger/src/lib.rs	93.0% <0.0%> (ø)
opentelemetry-datadog/src/exporter/model/mod.rs	77.3% <0.0%> (ø)
opentelemetry-sdk/src/trace/runtime.rs	15.7% <0.0%> (+0.3%)	⬆️
opentelemetry-jaeger/src/exporter/mod.rs	54.0% <0.0%> (+3.0%)	⬆️

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[hdost]

#1106 instead.