Add Exponetial Histograms to otlp transforms

[MadVikingGod]

This enables the OTLP exporter to send expo histograms.

part of #2966

[codecov]

Codecov Report

Merging #4222 (fbcfa91) into main (fc88a6a) will increase coverage by 0.0%.
The diff coverage is 100.0%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4222   +/-   ##
=====================================
  Coverage   83.4%   83.5%           
=====================================
  Files        181     181           
  Lines      14115   14161   +46     
=====================================
+ Hits       11783   11831   +48     
+ Misses      2105    2103    -2     
  Partials     227     227           

Impacted Files	Coverage Δ
...s/otlp/otlpmetric/internal/transform/metricdata.go	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes