otellogr: record.SetErr for error

[pellared]

otellogr should set the error as field instead of attributes

opentelemetry-go-contrib/bridges/otellogr/logsink.go

Lines 229 to 231 in 2c2127d

	record.AddAttributes(
	log.String(string(semconv.ExceptionMessageKey), err.Error()),
	)

[iblancasa]

I can work on this.