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/explorer/node-builders.lua

@@ -3,6 +3,10 @@ local watch = require "nvim-tree.explorer.watch"
 
 local M = {}
 
+---@param parent Node
+---@param absolute_path string
+---@param name string
+---@return Node
 function M.folder(parent, absolute_path, name)
   local handle = vim.loop.fs_scandir(absolute_path)
   local has_children = handle and vim.loop.fs_scandir_next(handle) ~= nil
@@ -25,8 +29,8 @@ function M.folder(parent, absolute_path, name)
 end
 
 --- path is an executable file or directory
---- @param absolute_path string
---- @return boolean
+---@param absolute_path string
+---@return boolean|nil
 function M.is_executable(absolute_path)
   if utils.is_windows or utils.is_wsl then
     --- executable detection on windows is buggy and not performant hence it is disabled
@@ -36,6 +40,10 @@ function M.is_executable(absolute_path)
   end
 end
 
+---@param parent Node
+---@param absolute_path string
+---@param name string
+---@return Node
 function M.file(parent, absolute_path, name)
   local ext = string.match(name, ".?[^.]+%.(.*)") or ""
 
@@ -55,6 +63,10 @@ end
 -- links (for instance libr2.so in /usr/lib) and thus even with a C program realpath fails
 -- when it has no real reason to. Maybe there is a reason, but errno is definitely wrong.
 -- So we need to check for link_to ~= nil when adding new links to the main tree
+---@param parent Node
+---@param absolute_path string
+---@param name string
+---@return Node
 function M.link(parent, absolute_path, name)
   --- I dont know if this is needed, because in my understanding, there isn't hard links in windows, but just to be sure i changed it.
   local link_to = vim.loop.fs_realpath(absolute_path)