BEFORE this commit:
Telemere captured OpenTelemetry context only when generating
tracing signals (`trace!`, `spy!`, etc.).
AFTER this commit:
Telemere always captures OpenTelemetry context when present.
Motivation for the change:
Telemere users may have spans automatically created by the
OpenTelemetry Java Agent, or manually created by other libs
like clj-otel.
By always capturing the OpenTelemetry context when present,
this lets even non-tracing Telemere signals (like `log!`)
include the relevant trace and span IDs for external tooling.
Thanks to @devurandom for suggesting this, and for helping
debug/identify the necessary changes 🙏
