Inherit tracing spans, if the program uses tracing #80
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some programs use tracing, a log-compatible logging framework. tracing allows programs to prefix log messages with additional context via span!() or #[instrument], but StderrThread spawns a new thread to read command output, so this context is lost.
this patch adds an optional feature “tracing” with an optional dependency on tracing. when enabled, StderrThread::new() propagates the current span (if any) from the calling thread to the new thread. as a result, any context added by the calling thread is preserved in the info logs generated by stderr.