Add additional service network alias (project_name + service_name).

Description

By default, a service has 3 network aliases: container name, service name, container id.
Would be great to have one more default alias which would be computed from docker compose project name and service name. For example: project name: micro1, service name: app, so the alias would be: micro1-app.
This alias would help with solving the problem with DNS service name collisions when multiple Docker Compose projects are connected together with external networks.

Example:

docker-compose (A)
  services:
    app:
      networks:
        default:
    web:
      networks:
        default:
        common:
docker-compose (B)
  services:
    app:
      networks:
        common:
        default:

The service web from compose A calling service app may call his internal service app or external service app from compose B.

Having a default alias like docker compose project name and service name would resolve the problem.

Currently, without this feature, I see 2 solutions:

1. make all service name unique in all docker compose projects;
2. set unique alias names in all docker compose projects,

It there is another solution, please write in comments.

Thank you.

Start by tracing how Docker Compose assigns service network aliases and combines project and service names. Confirm the desired behavior against the multi-project external-network example, then define tests showing that the additional project-service alias is present without changing existing aliases.