Take advantage of dd-trace autoinject feature

[erickhun]

Take advantage of dd-trace to add trace to BuffLog.
This is based on @esclapes recommendation.

If a service want this feature, it will simply need to have those lines set at the beginning of the service:

// make sure to put those lines at the very beginning of your service
import tracer from "dd-trace";
tracer.init({
    //  will automatically append the traces to BuffLog
    logInjection: true

    // ... all other options...
});