Function parse_benchmark_events_from_captured_output 

pub fn parse_benchmark_events_from_captured_output(
    stdout: &str,
    stderr: &str,
    config: &BenchmarkParserConfig,
) -> BenchmarkParseReport

Parse separately captured stdout and stderr.

Separate streams do not carry global ordering, so events are returned in stdout-then-stderr order. If a benchmark span can start on one stream and end on the other, capture combined process output and use parse_benchmark_events.