Add attributes property to InstrumentationScope

[martinkuba]

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Is your feature request related to a problem? Please describe.

Per spec here, InstrumentationScope may hold additional attributes. The proto definition includes the attributes field.

[github-actions[bot]]

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[danopia]

This is as per spec, should it be able to stale out?

[dermasmid]

whats the difference between this and #4365? or is it the same?

[martinkuba]

This applies to the InstrumentationScope context that is applicable to spans, metrics, and logs. I think https://github.com/open-telemetry/opentelemetry-js/issues/4365 is specific to metrics.