Move Aggregation/Temporality selection to the Exporter interface

[MrAlias]

The OpenTelemetry specification defines the metric exporter interface as a type that defines the aggregation and temporality properties of the Metric SDK through the reader they are registered with:

The aggregation and temporality properties used by the OpenTelemetry Metric SDK are determined when registering Metric Exporters through their associated MetricReader.

Similar to the Java and Python, this updates the Exporter interface to handle this communication of values through their associated reader.

Related to #3244

[codecov]

Codecov Report

Merging #3260 (23c85af) into main (c8a13d6) will decrease coverage by 0.2%.
The diff coverage is 61.8%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3260     +/-   ##
=======================================
- Coverage   77.9%   77.7%   -0.3%     
=======================================
  Files        164     164             
  Lines      11361   11457     +96     
=======================================
+ Hits        8861    8909     +48     
- Misses      2301    2346     +45     
- Partials     199     202      +3     

Impacted Files	Coverage Δ
exporters/otlp/otlpmetric/otlpmetricgrpc/config.go	41.8% <0.0%> (-3.3%)	⬇️
exporters/otlp/otlpmetric/otlpmetrichttp/config.go	85.7% <0.0%> (-14.3%)	⬇️
sdk/metric/aggregation/aggregation.go	77.4% <ø> (ø)
sdk/metric/reader.go	100.0% <ø> (+24.4%)	⬆️
exporters/otlp/otlpmetric/exporter.go	67.2% <25.0%> (-17.8%)	⬇️
exporters/otlp/otlpmetric/otlpmetricgrpc/client.go	84.9% <42.8%> (-3.0%)	⬇️
exporters/otlp/otlpmetric/otlpmetrichttp/client.go	77.5% <42.8%> (-1.6%)	⬇️
sdk/metric/manual_reader.go	78.6% <65.2%> (-6.0%)	⬇️
...xporters/otlp/otlpmetric/internal/oconf/options.go	79.8% <72.4%> (-1.7%)	⬇️
exporters/stdout/stdoutmetric/config.go	72.9% <72.4%> (-0.8%)	⬇️
... and 7 more