[WIP][SPARK-3797] Run external shuffle service in Yarn NM

This creates a new module `network/yarn` that depends on `network/shuffle` recently created in #3001. This PR introduces a custom Yarn auxiliary service that runs the external shuffle service. As of the changes here this shuffle service is required for using dynamic allocation with Spark.

This is still WIP mainly because it doesn't handle security yet. I have tested this on a stable Yarn cluster.
Hm, that's true. We can still call `sc.killExecutors` without the external shuffle service, though if the application explicitly calls that then I would assume that it's aware of what it's doing. In this case I prefer to require the service for dynamic allocation because much of this happens under the hood.