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/enum.lua

@@ -1,5 +1,13 @@
 local M = {}
 
+---Must be synced with uv.fs_stat.result as it is compared with it
+---@enum (key) NODE_TYPE
+M.NODE_TYPE = {
+  directory = 1,
+  file = 2,
+  link = 4,
+}
+
 ---Setup options for "highlight_*"
 ---@enum HL_POSITION
 M.HL_POSITION = {