fix(vim.fs): fs.dir() may return nil "type" on some filesystems #39749

Problem:
Currently, only some filesystems (Btrfs, ext2, ext3, ext4) have full
support of accessing the `dirent` entry-type. On other filesystems,
`uv.fs_scandir_next` may return `nil` for an existing but unsupported
entry-type.

This means consumers (such as `fs.dir()`), cannot know if `nil` means
"non-existent" or "unsupported".

Solution:
Fall back to `uv.fs_lstat` when `etype` is `nil`; return "unknown" if it
fails.

0 files changed, 0 insertions, 0 deletions