ruff

0a0eaf5a - [ty] Make auto-import completions opt-in via an experimental option

[ty] Make auto-import completions opt-in via an experimental option Instead of waiting to land auto-import until it is "ready for users," it'd be nicer to get incremental progress merged to `main`. By making it an experimental opt-in, we avoid making the default completion experience worse but permit developers and motivated users to try it.