Add semantic conventions for container id

[wangzlei]

Currently Container Attributes in Resource have only container.name to represent the container instance. I am proposing adding container.id as a Container attribute.
Refer to docker documentation Container identification, Container's full-id, short-id and name are equivalent in docker CLI like 'docker info '. name is usually human readable and can be changed by command 'docker rename' during runtime.

And AWS X-ray uses container.id represent the container instance in ECS, adding container.id in OpenTelemetry would be great helpful for X-Ray.