Support multiple-resource pipelines w/ a ResourceMap #490
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Description: Add a shared internal package, in it a common ResourceMap type. This caches the first resource value and re-uses it when possible, which is the common case. When the SDK Exporter is used for exporting generally (e.g., forwarding) it will fall back to the slower path but still be correct.
Adds new
lightstep/sdk/trace
go module to avoid a cycle.Testing: New tests / benchmarks added.