ruff

046893c1 - [ty] Make `Module::all_submodules` return `Module` instead of `Name`

[ty] Make `Module::all_submodules` return `Module` instead of `Name` This is to facilitate recursive traversal of all modules in an environment. This way, we can keep asking for submodules. This also simplifies how this is used in completions, and probably makes it faster. Namely, since we return the `Module` itself, callers don't need to invoke the full module resolver just to get the module type. Note that this doesn't include namespace packages. (Which were previously not supported in `Module::all_submodules`.) Given how they can be spread out across multiple search paths, they will likely require special consideration here.