Reuse memory in metric pipelines

[MadVikingGod]

This change starts the process of reusing memory from slices.

This does reduce the number of allocations in the histogram benchmark to 4x the number of collects

[codecov]

Codecov Report

Merging #3760 (f9e2be3) into main (7dc7b30) will decrease coverage by 0.1%.
The diff coverage is 86.5%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3760     +/-   ##
=======================================
- Coverage   81.6%   81.6%   -0.1%     
=======================================
  Files        168     169      +1     
  Lines      12477   12489     +12     
=======================================
+ Hits       10193   10201      +8     
- Misses      2069    2073      +4     
  Partials     215     215             

Impacted Files	Coverage Δ
sdk/metric/pipeline.go	89.5% <76.0%> (-1.2%)	⬇️
sdk/metric/periodic_reader.go	91.8% <94.7%> (+0.1%)	⬆️
sdk/metric/internal/reuse_slice.go	100.0% <100.0%> (ø)
sdk/metric/manual_reader.go	85.0% <100.0%> (-0.2%)	⬇️
sdk/metric/reader.go	100.0% <100.0%> (ø)