[CI/Build] Cross python wheel

[robertgshaw2-redhat]

SUMMARY:

• due to shift toward TORCH_LIBRARY from PYBIND, we can now build a single wheel for all python versions
• updates build stage of dockerfile to use --py-limited-api=cp38
• updated buildkite release workflow to avoid python matrix

BEFORE SUBMITTING, PLEASE READ THE CHECKLIST BELOW AND FILL IN THE DESCRIPTION ABOVE

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[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.
Just a reminder: PRs would not trigger full CI run by default. Instead, it would only trigger fastcheck CI to run, which consists only a small and essential subset of tests to quickly catch small errors.

Full CI run is still required to merge this PR so please make sure that you run full CI before merging or if you need more test signals.

To run full CI, you can do one of these:

• Add ready label to the PR
• Comment /ready on the PR
• Enable auto-merge.

🚀

[robertgshaw2-redhat]

/ready

[robertgshaw2-redhat]

@simon-mo @khluu

I think this should be good to go. Release workflow is green. I don't know how to download the wheels from s3 though. So would one of you guys mind verifying that youre able to install and run on python 3.8 - 3.11?

I have verified locally that the wheels built with python3 setup.py bdist_wheel --dist-dir=dist --py-limited-api=cp38 can be installed on the various python versions

[youkaichao]

thanks for the great pr! a followup would be needed to update https://docs.vllm.ai/en/latest/getting_started/installation.html to guide people how to download these wheels.