feat(metrics-sdk): bootstrap aggregation support

[legendecas]

Which problem is this PR solving?

Bootstraps aggregation and aggregator support. Use cases can be reviewed on #2636.

• Aggregation is responsible for selecting concrete Aggregator type for an InstrumentDescriptor.
• Aggregator is stateless, and is responsible for merging, diffing stateful accumulations.
• Accumulation is aggregated state for a metric stream in a period of time.

Fixes #2599

This is a prototype of the implementation described in https://docs.google.com/document/d/1EluDhj5UanNATS3hR8xx30sv55Se7uYjsGYslvNWHtc/edit#.

Short description of the changes

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Basic interface testing

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

Merging #2634 (42bba7d) into main (f51f853) will increase coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2634      +/-   ##
==========================================
+ Coverage   93.10%   93.36%   +0.26%     
==========================================
  Files         123      131       +8     
  Lines        4757     4932     +175     
  Branches     1059     1078      +19     
==========================================
+ Hits         4429     4605     +176     
+ Misses        328      327       -1     

Impacted Files	Coverage Δ
...es/opentelemetry-sdk-metrics-base/src/view/View.ts	100.00% <0.00%> (ø)
...-metrics-base/src/export/AggregationTemporality.ts	100.00% <0.00%> (ø)
...metry-sdk-metrics-base/src/aggregator/Histogram.ts	98.00% <0.00%> (ø)
...telemetry-sdk-metrics-base/src/aggregator/types.ts	100.00% <0.00%> (ø)
...metry-sdk-metrics-base/src/aggregator/LastValue.ts	100.00% <0.00%> (ø)
...elemetry-sdk-metrics-base/src/export/MetricData.ts	100.00% <0.00%> (ø)
...ntelemetry-sdk-metrics-base/src/aggregator/Drop.ts	100.00% <0.00%> (ø)
...entelemetry-sdk-metrics-base/src/aggregator/Sum.ts	100.00% <0.00%> (ø)
...telemetry-sdk-metrics-base/src/aggregator/index.ts	100.00% <0.00%> (ø)
...telemetry-sdk-metrics-base/src/view/Aggregation.ts	100.00% <0.00%> (+28.57%)	⬆️

[pirgeo]

I like this, but I have a few questions about the aggregation and temporarily (see comments).

[pirgeo]

I think this is great work! 💯

[dyladan]

There are a few small nits still open and a conflict. Once they are resolved I think we can merge this and move forward with other PRs