[WIP] Illustrate problem with baggage values

[yurishkuro]

Resolves #3685

While this technically resolves the ticket, I think this is the wrong change and instead #3226 should be reverted.

See: #3685 (comment)

[codecov]

Codecov Report

Merging #3689 (3e1e440) into main (f5a1497) will increase coverage by 0.0%.
The diff coverage is 100.0%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3689   +/-   ##
=====================================
  Coverage   79.7%   79.7%           
=====================================
  Files        171     171           
  Lines      12673   12674    +1     
=====================================
+ Hits       10103   10104    +1     
  Misses      2357    2357           
  Partials     213     213           

Impacted Files	Coverage Δ
baggage/baggage.go	97.4% <100.0%> (+<0.1%)	⬆️
bridge/opentracing/bridge.go	63.4% <100.0%> (ø)
sdk/trace/batch_span_processor.go	81.1% <0.0%> (-0.9%)	⬇️
exporters/jaeger/jaeger.go	91.1% <0.0%> (+0.8%)	⬆️