Ray 1.12: Ray AI Runtime (alpha), usage data collection, and more

Ray 1.12 is here! The highlights in this release include the alpha release of Ray AI Runtime (AIR), a unified experience for Ray libraries, as well as various updates to Ray's data processing and machine learning capabilities such as the Deployment Graph API in Ray Serve and improvements to Ray Datasets. The team also introduced usage data collection to help discover and address pressing issues, while giving users full control over how their data is used and collected. With these features and more, users can now run pip install -U ray to access the latest version of Ray 1.12.