fix(#2945): stack overflow on api.git.reload or fugitive event with watchers disabled (#2949)

* Reapply "refactor(#2871, #2886): multi instance: node classes created (#2916)"

This reverts commit 50e919426a.

* fix(#2945): stack overflow on api.git.reload or fugitive event

lua/nvim-tree/node/factory.lua

@@ -0,0 +1,31 @@
+local DirectoryNode = require("nvim-tree.node.directory")
+local LinkNode = require("nvim-tree.node.link")
+local FileNode = require("nvim-tree.node.file")
+local Watcher = require("nvim-tree.watcher")
+
+local M = {}
+
+---Factory function to create the appropriate Node
+---@param explorer Explorer
+---@param parent Node
+---@param abs string
+---@param stat uv.fs_stat.result? -- on nil stat return nil Node
+---@param name string
+---@return Node?
+function M.create_node(explorer, parent, abs, stat, name)
+  if not stat then
+    return nil
+  end
+
+  if stat.type == "directory" and vim.loop.fs_access(abs, "R") and Watcher.is_fs_event_capable(abs) then
+    return DirectoryNode:create(explorer, parent, abs, name, stat)
+  elseif stat.type == "file" then
+    return FileNode:create(explorer, parent, abs, name, stat)
+  elseif stat.type == "link" then
+    return LinkNode:create(explorer, parent, abs, name, stat)
+  end
+
+  return nil
+end
+
+return M