Retrieve the current trace in Go SDK

[josephschorr]

I'm curious to know whether there is a way to retrieve, in the Go SDK, the current trace from the current context as a read-only copy, one that could (in theory) be serialized over the wire.

I'm investigating an idea of adding a parameter to our API to return the OTEL trace alongside the API result, to aid in debugging upstream performance issues. Ideally, there would be a way at the beginning of the API handler to enforce that the trace is recorded if an incoming parameter is set to true, and then to encode the OTEL trace of the API's execution from that point to be returned in the response.