feature(explorer): group empty dirs as one directory

[uthmanmoh]

Did you check the docs?

• I have read all the snacks.nvim docs

Is your feature request related to a problem? Please describe.

In Java usually directories follow the structure below which gets rendered pretty ugly in a file tree since it takes up too much space.

Describe the solution you'd like

In neo-tree I had configured it like:

  {
    "nvim-neo-tree/neo-tree.nvim",
    opts = {
      filesystem = {
        -- Make neo-tree group empty directories like kotlin/com/example
        group_empty_dirs = true,
        scan_mode = "deep",
      },
    },
  },

Which would achieve my desired behaviour of grouping empty directories to make it look like just src/main/java/com was one directory in that example.

I see that this is just a picker but I don't see this sort of option available in the picker config either

Describe alternatives you've considered

Haven't considered any.

Additional context

No response

[xian-wen]

See #916