Improve Otel context extraction failure behavior

[erichulburd]

When rigetti/pyo3-opentelemetry#27 is resolved, create a callback to handle OTel context extraction failure.

My current persuasion is that the error should be traced using the tracing package. Some downstream applications execute and translate at a high rate. Context extraction failures may be due to the fact the Python side does not have opentelemetry package installed. We don't want to spam stderr. I suggest we make this a tracing::debug! event.