Add the Histogram Reservoir implementations

[MrAlias]

Part of #559

This PR is split from #4455

This adds a Reservoir implementation for histograms as described by the specification:

This implementation MUST keep the last seen measurement that falls within a histogram bucket.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e6e4c95) 82.5% compared to head (c0233af) 82.5%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4870   +/-   ##
=====================================
  Coverage   82.5%   82.5%           
=====================================
  Files        230     231    +1     
  Lines      18754   18762    +8     
=====================================
+ Hits       15480   15488    +8     
  Misses      2985    2985           
  Partials     289     289           

Files	Coverage Δ
sdk/metric/internal/exemplar/hist.go	100.0% <100.0%> (ø)