Add support for "isolaton" in Compose files

[Techwolfy]

The Compose v3 format includes a parameter to specify the type of container isolation that the host should use. This is always default on Linux, but can be either process or hyperv on Windows. This setting was added in v2.1 and has remained in the documentation since.

However, it was left out of the v3+ schema definition, so it currently can't be used in newer Compose files despite working correctly if the file version is downgraded. I've submitted a patch in docker/compose#5075 to fix this for local deployments. Swarm has never had support for this feature though so it will likely be a bit more complicated to fix.

Currently, running docker stack deploy -c docker-compose.yml swarm results in the error message isolation Additional property isolation is not allowed. I'm working on a Windows-based Swarm application and not all of the servers share an OS version so this feature would be quite helpful to me.

[thaJeztah]

For reference; this depends on moby/moby#31616 to be decided on (and implemented) first