Add ResponseMetered annotation for Jersey Resource (4.0-development)

[dennyac]

For Dropwizard services, we currently have metrics for response rates by HTTP status code (1xx, 2xx, 3xx, 4xx, 5xx) captured at Jetty . There have been use cases where it would be helpful to have it on a Jersey Resource method/class level. To achieve that, I've added @ResponseMetered annotation which will add meters for 1xx/2xx/3xx/4xx/5xx responses. I've reused the logic from com.codahale.metrics.jetty9.InstrumentedHandler to capture the metrics.

I hope you find this helpful and I'm open to suggestions/feedback. Thanks!

This is based of #1185 for the 4.0-development branch

@Path("/")
@Produces(MediaType.TEXT_PLAIN)
public class InstrumentedResource {
    @GET
    @ResponseMetered
    @Path("/responseMeteredEndpoint")
    public Response responseMeteredEndpoint() {
        return Response.ok().build();
    }
}

[dennyac]

Hi @arteam @jplock , just created the ResponseMetered annotation for 4.0-development.