chore: add type annotations and resolve LSP warnings (#2555)

* chore: add type annotations to (almost) all functions

* stylua

* Add classes for symlink nodes

* Replace deprecated `@vararg`

* Move node classes to `node` module

* Fix `Symlink*` classes

* add vim and libuv runtime for luals, qualify libuv types

* add scripts/luals-check, not quite ready for CI

* additional nil checks for git/init.lua and git/runner.lua

* additional nil checks for nvim-tree.lua

* wrap vim.cmd-as-a-function calls inside functions

* vim.tbl_filter predicate returns booleans

* Revert "add scripts/luals-check, not quite ready for CI"

This reverts commit c70229cad9.

* Add `MinimalNode` class in `marks` module

* Fix various LSP warnings

* stylua

* Fix `Explorer` class, update related annotations and add necessary checks

* Add missing annotations to `live-filter`

* Add temporary aliases for `uv.*` types

* Resolve remaining LSP warnings

* Revert changes not related to internal types

* Minor adjustments

* Update doc comments style

* Minor adjustments (pt. 2)

---------

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

lua/nvim-tree/core.lua

@@ -6,9 +6,11 @@ local log = require "nvim-tree.log"
 
 local M = {}
 
+---@type Explorer|nil
 local TreeExplorer = nil
 local first_init_done = false
 
+---@param foldername string
 function M.init(foldername)
   local profile = log.profile_start("core init %s", foldername)
 
@@ -23,6 +25,7 @@ function M.init(foldername)
   log.profile_end(profile)
 end
 
+---@return Explorer|nil
 function M.get_explorer()
   return TreeExplorer
 end
@@ -31,10 +34,12 @@ function M.reset_explorer()
   TreeExplorer = nil
 end
 
+---@return string|nil
 function M.get_cwd()
   return TreeExplorer and 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