Metrics aggregate collector generic over temporality

[fraillt]

Prerequisite for #2328

Changes

Provided several interfaces that allow to provide "ValueMap" implementation for specific temporality.
The key element is Collector (which implements AggregateCollector). It provides common functionality for all aggregations (Sum, LastValue, Histogram, etc...):

• provide attribute-set filtering functionality (for measurement).
• for specific temporality:
  • time initialization
  • aggregate data creation/initialization
  • collection of aggregation data
    This allow to have very clean concrete implementations. I have refactored ExponentialHistogram to use these new interfaces as an example.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 95.80838% with 7 lines in your changes missing coverage. Please review.

Project coverage is 77.9%. Comparing base (888d5a3) to head (01cd8a0).

Files with missing lines	Patch %	Lines
...-sdk/src/metrics/internal/exponential_histogram.rs	90.6%	6 Missing ⚠️
...pentelemetry-sdk/src/metrics/internal/collector.rs	98.6%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2506   +/-   ##
=====================================
  Coverage   77.9%   77.9%           
=====================================
  Files        123     124    +1     
  Lines      22943   22963   +20     
=====================================
+ Hits       17875   17900   +25     
+ Misses      5068    5063    -5     

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