[Announcement thread] Call for testing of new features

This issue serves as an announcment thread for new Tokio features that we want testers for. Please subscribe for updates to this issue if you want to be notified when there are new features that need testing before they can be enabled by default.

Current active experiments:

• Io uring
• https://github.com/tokio-rs/tokio/issues/7745
• Eager IO driver handoff
• LocalRuntime