client: add Kubernetes-aware retry helpers

[sttts]

Summary

Add client-go-style retry helper APIs for the sync and AIO Python clients.

• Shared primitives live in kubernetes/base/retry.py.
• Public sync helpers live in kubernetes.utils.retry.
• Public AIO helpers live in kubernetes.aio.utils.retry.
• Helpers cover 409 conflict retries for writes and Retry-After/backoff behavior for later generated read retry wiring.
• AIO utils are included in both setup-asyncio.py and the combined setup-release.py package list.

The generated REST/Configuration wiring is intentionally separate and follows in kubernetes-client/gen#304.

Validation

• .venv/bin/python -m unittest kubernetes.utils.retry_test kubernetes.aio.utils.retry_test
• .venv/bin/python -m pytest -q kubernetes/utils/retry_test.py kubernetes/aio/utils/retry_test.py
• .venv/bin/python -m pycodestyle ... for retry helpers, exports, and setup-release.py
• setup.py, setup-asyncio.py, and setup-release.py build_py checks confirmed symlinked helper files are copied as regular files
• git diff --check

Add Kubernetes-aware retry helper APIs for Python clients, modeled on client-go retry behavior.

[kubernetes-prow]

Welcome @sttts!

It looks like this is your first PR to kubernetes-client/python 🎉. Please refer to our pull request process documentation to help your PR have a smooth ride to approval.

You will be prompted by a bot to use commands during the review process. Do not be afraid to follow the prompts! It is okay to experiment. Here is the bot commands documentation.

You can also check if kubernetes-client/python has its own contribution guidelines.

You may want to refer to our testing guide if you run into trouble with your tests not passing.

If you are having difficulty getting your pull request seen, please follow the recommended escalation practices. Also, for tips and tricks in the contribution process you may want to read the Kubernetes contributor cheat sheet. We want to make sure your contribution gets all the attention it needs!

Thank you, and welcome to Kubernetes. 😃

[roycaihw]

/assign @yliaog

[sttts]

Fixed in the latest push: setup-release.py now includes kubernetes.aio.utils, so the combined release package includes the new AIO retry helpers.

I also verified setup-release.py build_py copies kubernetes/aio/utils/retry.py, kubernetes/aio/utils/_retry_base.py, and kubernetes/aio/utils/retry_test.py into the combined release build output, and updated the PR description with that validation.

[sttts]

Addressed the latest AIO naming review feedback in cd96f0e.

The public AIO retry helpers now use the same names as the sync helpers under the kubernetes.aio.utils.retry namespace:

• on_error
• retry_on_conflict
• on_retry_after_error

The generated AIO wiring follow-up in kubernetes-client/gen#304 was updated as well.

[yliaog]

thanks for the PR
/lgtm
/approve

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sttts, yliaog

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [yliaog]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment