Add a way to forward accelerators to Docker containers

[adamnovak]

This fixes #4486 by adding a way for apiDockerCall to call Docker containers with GPUs, and to pass through the right GPUs according to the environment variables that Toil sees.

We don't have any GPUs on CI to test this yet, sadly.

I looked and we don't have to do anything else with the Slurm environment variables for GPUs for WDL. MiniWDL's executor for Docker can't do GPUs, and the Singularity one runs the container under the current cgroup and can't escape Slurm's confinement.

Changelog Entry

To be copied to the draft changelog by merger:

• Toil can now send the right accelerators to containers launched with apiDockerCall().

Reviewer Checklist

• Make sure it is coming from issues/XXXX-fix-the-thing in the Toil repo, or from an external repo.
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    contrib/admin/test-pr otheruser theirbranchname issues/XXXX-fix-the-thing
    

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Merger Checklist

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[DailyDreaming]

Two minor comments, otherwise LGTM.

[DailyDreaming]

LGTM.

[DailyDreaming]

Nice. I usually forget to do this.