[draft] Add initial version of vllm rocm build script

[Daniel-Schenker]

Checklist

• Have you checked and followed all the points mention in the CONTRIBUTING.MD
• Have you validated script on UBI 9 container (UBI10)
• Did you run the script(s) on fresh container with set -e option enabled and observe success ?
• Did you have Legal approvals for patch files ?

This draft PR adds the initial version of the vllm rocm build script. This PR is a WIP as the script needs further updates once its dependencies are all added and ingested by devpi. Currently, the script expects local wheels for packages like z3, tilelang, runai-model-streamer, and triton. It also expects rocm to already be installed in the build environment. The script in this PR will be updated once the dependent packages are available upstream.

[Daniel-Schenker]

@cdeepali I have opened this PR as a draft so that your team can see the format of this build script. Please do not merge yet as there are changes still needed as stated above.