Nest async client under kubernetes.aio to fix kubernetes-asyncio collision

[karimzakzouk]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Right now, setup-release.py installs the new async client as a top-level package called kubernetes_asyncio. The problem is that this directly collides with the existing kubernetes-asyncio package on PyPI. When people try to install both, they overwrite each other's files and break.

This PR fixes that by nesting the async client under kubernetes.aio instead (using setuptools package_dir). This matches what other big libraries do (like redis.asyncio or grpc.aio) and cleanly avoids the naming collision.

The main changes:

• Updated setup-release.py to map the package to kubernetes.aio
• Switched the absolute imports in kubernetes_asyncio/ to relative imports so the code works whether it's installed via the release bundle or as a standalone package for dev.
• Added a simple try/except in kubernetes/__init__.py to optionally expose the aio module.
• Updated the examples to use the new kubernetes.aio import path.

Which issue(s) this PR fixes:

Fixes #2583

Special notes for your reviewer:

Most of the files changed here are just bulk mechanical fixes (switching from kubernetes_asyncio.client... to relative imports) across the code.

The actual logic changes are pretty small and isolated to setup-release.py, the two __init__.py files, and api_client.py.

Note: We'll probably want to update the OpenAPI generator templates in a follow-up PR to spit out relative imports by default for future generation runs.

Does this PR introduce a user-facing change?

The bundled async client is now available at `kubernetes.aio` instead of `kubernetes_asyncio` to prevent overwriting the external `kubernetes-asyncio` package on PyPI. If you were using the new async client from v36.0.0, please update your imports from `from kubernetes_asyncio import client` to `from kubernetes.aio import client`.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

NONE

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[roycaihw]

/assign @yliaog

[yliaog]

@karimzakzouk thanks for the PR, many files in this repo are generated, it is better to fix it in the script generator.

I created a PR #2590 to switch from kubernetes_asyncio to kuberentes_aio to avoid the conflict. Please take a look.

[karimzakzouk]

@yliaog That makes perfect sense, fixing it directly in the generator scripts is the right move. Thanks for the comment

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[karimzakzouk]

@yliaog Following up on your comment. Yes, I agree we should fix it in the generator scripts, so I updated this PR to do exactly that.

I also added a script to scripts/update-client-asyncio.sh. It automatically changes all the absolute imports to relative imports right after the generation finishes.
I left a comment on #2590 to explain how this solves the namespace issue as kubernetes.aio, while keeping the repository directory clean and flat for us.

All tests pass locally. Please take a look.