[POC] Histogram Boundry Hints

[MadVikingGod]

• Adds Histogram Boundry Hints to the Metric API
• Plumbed through the pipelines so that hints + no aggregation selected in the view yields a histogram with the hints.

Cons:

• This adds a specific creation path for histograms that is separate from the other instruments
• Because the creation assumed that configuration came from the view, not from the API, the logic for the hints is buried meter -> InstProvider -> Resolver -> []inserters before the cache lookup is done.

[codecov]

Codecov Report

Merging #4340 (e588ae2) into main (c197fe9) will decrease coverage by 0.2%.
The diff coverage is 71.9%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #4340     +/-   ##
=======================================
- Coverage   83.4%   83.3%   -0.2%     
=======================================
  Files        184     185      +1     
  Lines      14330   14370     +40     
=======================================
+ Hits       11957   11971     +14     
- Misses      2147    2171     +24     
- Partials     226     228      +2     

Impacted Files	Coverage Δ
metric/syncfloat64.go	75.0% <0.0%> (-25.0%)	⬇️
metric/syncint64.go	75.0% <0.0%> (-25.0%)	⬇️
sdk/metric/pipeline.go	90.6% <84.2%> (-0.7%)	⬇️
sdk/metric/instrument.go	91.8% <100.0%> (ø)
sdk/metric/meter.go	86.0% <100.0%> (+0.1%)	⬆️

... and 3 files with indirect coverage changes

[MrAlias]

Prototype of #4162

[MrAlias]

Reviewed in the SIG, and we concluded this satisfies the PoC requirement. Closing.