[WIP] New Ray Serve tutorial

[crypdick]

Adds a new tutorial serving Pytorch models on Ray Serve.

This should be merged after https://github.com/pytorch/tutorials/pull/3694 since otherwise the new Ray version will break the existing Tune tutorial.

I will remove the [WIP] label after the Ray Serve team finishes their review.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3709

• :page_facing_up: Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

:x: 3 New Failures

As of commit 970805cb744893866b7e5f6303b9ee8182ef6dae with merge base ebe3e9fe11f2d9837d77ee9c7967b131c862894f ():

NEW FAILURES - The following jobs have failed:

• Build tutorials (nightly/test) / build / pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu) (gh) Process completed with exit code 2.
• Build tutorials / build / pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu) (gh) Process completed with exit code 2.
• link check on PR / linkChecker (gh) Process completed with exit code 1.

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[AlannaBurke]

This looks sane to me, but let's make sure everything is passing.