Track refactoring of "aws.origin" tag

[codefromthecrypt]

From @anuraaga on #171 cc @iamsouravin

One high level note is origin can actually be inferred by other tags, if we were to actually populate them.

The segment has an aws struct here

https://docs.aws.amazon.com/xray/latest/devguide/xray-api-segmentdocuments.html#api-segmentdocuments-aws

So instead of origin, we could process tags like this into the segment for a more complete picture (and origin could be inferred)

aws.beanstalk.environment_name
aws.beanstalk.version_label
aws.beanstalk.deployment_id
aws.ecs.container
aws.ec2.instance_id
aws.ec2.availability_zone