Implement image streaming for Google Batch

[thalassemia]

Closes #4719. This improves startup time for jobs in my workflow from ~2.5 minutes to ~1 minute (image about 600MB compressed). It does, however, come with some pretty important limitations, most notably ignoring the process.containerOptions setting.

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[pditommaso]

Well limitation are not just about containerOptions. For Google docs

• Batch only supports Image streaming for container images that are stored in Artifact Registry. If you currently use Container Registry to manage your container images, you can transition to Artifact Registry.
• You must run your Batch job's VMs in the same location as where you store your container image in Artifact Registry.
• Containers that use the Docker image manifest version 2, schema 1 aren't supported.
• When you use Image streaming, containers runnables only support the following fields:
  • imageUri
  • commands
  • entrypoint
  • volumes
  • enableImageStreaming
• Container images with empty layers or duplicate layers aren't supported.

https://docs.cloud.google.com/batch/docs/use-image-streaming

[thalassemia]

Yes, I link to that exact page in the docs as part of my PR.