[Metrics API/SDK] Add InstrumentationScope attributes in MeterProvider::GetMeter()

[lalitb]

As mentioned in the specs, it should be possible to optionally pass the InstrumentationScope attributes while creating/fetching a Meter through MeterProvider.

Get a Meter

This API MUST accept the following parameters:
 * name (required)
 * version (optional)
 * [since 1.4.0] schema_url (optional)
 * [since 1.13.0] attributes (optional)

With #2004, the InstrumentationScope class already support storing the attributes.

The relevant metric exporters - OTLP, OStream, Prometheus(?) should be modified to support sending/dumping these attributes.

Also this would be an API/ABI breaking change (modifying/overloading the virtual method in the API), so need to be planned accordingly.

[github-actions]

This issue was marked as stale due to lack of activity.