[SDK] Add meter scope configurator

[psx95]

Contributes to #2641

Adds scope configurator for Meters.

Changes

• Updates the Metrics SDK to add support for MeterConfigurator as per the spec changes.
• Adds a MeterConfig class that can be used to configure a meter's behavior as per spec.

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

[netlify]

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Name	Link
🔨 Latest commit	e75db69
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[codecov]

Codecov Report

Attention: Patch coverage is 73.68421% with 15 lines in your changes missing coverage. Please review.

Project coverage is 87.91%. Comparing base (3ca3c76) to head (e75db69).

Files with missing lines	Patch %	Lines
sdk/src/metrics/meter.cc	53.13%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3268      +/-   ##
==========================================
- Coverage   87.96%   87.91%   -0.04%     
==========================================
  Files         205      207       +2     
  Lines        6407     6457      +50     
==========================================
+ Hits         5635     5676      +41     
- Misses        772      781       +9     

Files with missing lines	Coverage Δ
sdk/include/opentelemetry/sdk/metrics/meter.h	57.15% <ø> (ø)
...k/include/opentelemetry/sdk/metrics/meter_config.h	100.00% <100.00%> (ø)
sdk/src/metrics/meter_config.cc	100.00% <100.00%> (ø)
sdk/src/metrics/meter_context.cc	77.34% <100.00%> (+1.28%)	⬆️
sdk/src/metrics/meter_provider.cc	87.18% <100.00%> (ø)
sdk/src/metrics/meter_provider_factory.cc	82.36% <100.00%> (+7.36%)	⬆️
sdk/src/metrics/meter.cc	60.50% <53.13%> (-1.85%)	⬇️

... and 1 file with indirect coverage changes