Define the Python deprecation/supporting policies for the Katib SDK

[tenzen-y]

/kind feature

Describe the solution you'd like
[A clear and concise description of what you want to happen.]
As we discussed in #2278 (comment), currently, we support the following Python versions for the SDK, but we don't have any policies to decide which versions we should drop/support the Python version. So, we should define the Python deprecation/supporting policies for the SDK.

katib/sdk/python/v1beta1/setup.py

Lines 56 to 61 in 5837b8a

	"Programming Language :: Python :: 3",
	"Programming Language :: Python :: 3 :: Only",
	"Programming Language :: Python :: 3.7",
	"Programming Language :: Python :: 3.8",
	"Programming Language :: Python :: 3.9",
	"Programming Language :: Python :: 3.10",

Additionally, I believe that it is possible to apply the same policies to the training-operator.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Appendix:

• JupyterLab's policies: https://github.com/jupyterlab/jupyterlab/blob/main/pyproject.toml#L13
• Jupyter Server policies: https://github.com/jupyter-server/jupyter_server/blob/main/pyproject.toml#L24

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[tenzen-y]

cc: @kubeflow/wg-automl-leads

[andreyvelich]

cc @kubeflow/wg-training-leads @droctothorpe @shipengcheng1230 @andreafehrman @harrisonfritz @kuizhiqing @yaobaiwei

[droctothorpe]

I suggest either EOL or some small grace period after EOL just from a security perspective:
https://devguide.python.org/versions/

FWIW, pipelines still supports 3.7 😢 :
https://github.com/kubeflow/pipelines/blob/master/sdk/python/setup.py#L102

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[tenzen-y]

/remove-lifecycle stale

[andreyvelich]

@tenzen-y Should we just update our SDK readme to say that we are going to follow Python EOL cycle: https://devguide.python.org/versions/ ?

[tenzen-y]

@tenzen-y Should we just update our SDK readme to say that we are going to follow Python EOL cycle: https://devguide.python.org/versions/ ?

SGTM