[Metric SDK] Synchronous Instruments - Aggregation Storage(s) creation for configured views

[lalitb]

Fixes #1217

Changes

Create and store Aggregation Storage(s) as per the logic described in #1217

Refer to the flow in architecture ( https://docs.google.com/document/d/17PiDI91MQy07kkiSJ7lvlnogvMD3FV85g__WEackj1M ) which shows Aggregation Storage as SyncMetricStorage and AsyncMetricStorage, and the same name is used in the code.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #1219 (7947f1e) into main (9157fd4) will decrease coverage by 0.66%.
The diff coverage is 61.03%.

@@            Coverage Diff             @@
##             main    #1219      +/-   ##
==========================================
- Coverage   92.96%   92.31%   -0.65%     
==========================================
  Files         196      198       +2     
  Lines        7040     7118      +78     
==========================================
+ Hits         6544     6570      +26     
- Misses        496      548      +52     

Impacted Files	Coverage Δ
...ntelemetry/sdk/metrics/view/attributes_processor.h	100.00% <ø> (ø)
sdk/include/opentelemetry/sdk/metrics/view/view.h	66.67% <0.00%> (+3.04%)	⬆️
sdk/src/metrics/meter_context.cc	36.37% <0.00%> (-1.73%)	⬇️
sdk/test/metrics/sync_metric_storage_test.cc	100.00% <ø> (ø)
sdk/src/metrics/meter.cc	8.83% <4.55%> (-9.35%)	⬇️
sdk/test/metrics/multi_metric_storage_test.cc	68.43% <68.43%> (ø)
...telemetry/sdk/metrics/state/multi_metric_storage.h	84.62% <84.62%> (ø)
...ntelemetry/sdk/metrics/state/sync_metric_storage.h	52.95% <100.00%> (ø)
...clude/opentelemetry/sdk/metrics/sync_instruments.h	100.00% <100.00%> (ø)
sdk/src/metrics/sync_instruments.cc	100.00% <100.00%> (ø)
... and 2 more

[esigo]

LGTM
Thanks for the PR.