Skeleton for keypoints tutorial

[AntoineSimoulin]

Context

This PR improves KeyPoints documentation by adding a tutorial on how to use this data structure shipped with TorchVision 0.23 release. It is relatively similar to the Transforms on Rotated Bounding Boxes tutorial for rotated bounding boxes.

As illustrated below, the tutorial illustrate how to create KeyPoints instances, apply transforms to those, and plot the result.

For this tutorial, we use this picture from a ceramic figures from the pre-columbian period. The image is specified "public domain".

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9209

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⏳ 5 Pending, 3 Unrelated Failures

As of commit 28605ad with merge base a8dc530 ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Build Aarch64 Linux Wheels / pytorch/vision / build-wheel-py3_10-cuda-aarch6413_0-aarch64 (gh) (trunk failure)
  ImportError: libarm_compute.so: cannot open shared object file: No such file or directory
• Build Aarch64 Linux Wheels / pytorch/vision / upload / upload-wheel-py3_10-cuda-aarch6413_0-aarch64 (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found for name: pytorch_vision__3.10_cu130_aarch64
• CMake / windows (windows.g5.4xlarge.nvidia.gpu, cuda, 12.6) / windows-job (gh) (trunk failure)
  Process completed with exit code 1.

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[NicolasHug]

Thanks @AntoineSimoulin !

[github-actions]

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