* Accept scope attr during Meter creation
* Fix lint
* Add changes to changelog
* Return a Set from InstrumentationAttributes
Likely these attributes will be stored as a Set in the SDK. Don't cause
two conversions because we return a slice here.
* Add config tests
* Fix lint
* Add WithScopeAttributes MeterOption to metric pkg
* Add MeterConfig unit tests
* Add changes to changelog
* Fix import linting
* Update MeterProvider documentation
Include information about how to use WithScopeAttributes.