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`

---------

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

lua/nvim-tree/actions/fs/init.lua

@@ -0,0 +1,16 @@
+local M = {}
+
+M.copy_paste = require "nvim-tree.actions.fs.copy-paste"
+M.create_file = require "nvim-tree.actions.fs.create-file"
+M.remove_file = require "nvim-tree.actions.fs.remove-file"
+M.rename_file = require "nvim-tree.actions.fs.rename-file"
+M.trash = require "nvim-tree.actions.fs.trash"
+
+function M.setup(opts)
+  M.copy_paste.setup(opts)
+  M.remove_file.setup(opts)
+  M.rename_file.setup(opts)
+  M.trash.setup(opts)
+end
+
+return M