Add 0.12.0 release notes#694

mhelf-intel wants to merge 2 commits intovllm-project:releases/v0.12.0vllm-project/vllm-gaudi:releases/v0.12.0from

mhelf-intel:doc-0.12.0mhelf-intel/vllm-gaudi:doc-0.12.0Copy head branch name to clipboard