refactor: improve API readability and tidy actions submodules (#2593)

* refactor: improve API readability, tidy actions modules

* Apply requested changes

* `actions/reloaders/reloaders.lua` -> `actions/reloaders.lua`

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Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/actions/fs/remove-file.lua

@@ -112,7 +112,7 @@ function M.fn(node)
   local function do_remove()
     M.remove(node)
     if not M.config.filesystem_watchers.enable then
-      require("nvim-tree.actions.reloaders.reloaders").reload_explorer()
+      require("nvim-tree.actions.reloaders").reload_explorer()
     end
   end