Add labels when using Dockerfile or Compose

[Roemer]

This PR adds the possibility to add labels when using a Dockerfile or Compose.

[johnitvn]

I have encountered this error in practice. Hope this error will be fixed soon.

[chrmarti]

We are passing them on here for images: https://github.com/devcontainers/cli/blob/f475b2be4c516e0b7191b338328210eae1ad9d62/src/spec-node/containerFeatures.ts#L116

This is missing here: https://github.com/devcontainers/cli/blob/f475b2be4c516e0b7191b338328210eae1ad9d62/src/spec-node/singleContainer.ts#L215

It is also missing on the Docker Compose code path. Docker Compose doesn't add labels to the built images, it adds them to the containers.

[Roemer]

I actually gave it a try and implemented it in this PR, so it is ready for review.