chore: add type annotations to (almost) all functions

lua/nvim-tree/core.lua

@@ -9,6 +9,7 @@ local M = {}
 TreeExplorer = nil
 local first_init_done = false
 
+---@param foldername string
 function M.init(foldername)
   local profile = log.profile_start("core init %s", foldername)
 
@@ -23,14 +24,17 @@ function M.init(foldername)
   log.profile_end(profile)
 end
 
+---@return table
 function M.get_explorer()
   return TreeExplorer
 end
 
+---@return string
 function M.get_cwd()
   return TreeExplorer.absolute_path
 end
 
+---@return integer
 function M.get_nodes_starting_line()
   local offset = 1
   if view.is_root_folder_visible(M.get_cwd()) then