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/explore.lua

@@ -11,10 +11,17 @@ local Watcher = require "nvim-tree.watcher"
 
 local M = {}
 
+---@param type_ string|nil
+---@param cwd string
+---@return any
 local function get_type_from(type_, cwd)
   return type_ or (vim.loop.fs_stat(cwd) or {}).type
 end
 
+---@param handle uv.uv_fs_t
+---@param cwd string
+---@param node Node
+---@param git_status table
 local function populate_children(handle, cwd, node, git_status)
   local node_ignored = explorer_node.is_git_ignored(node)
   local nodes_by_path = utils.bool_record(node.nodes, "absolute_path")
@@ -53,6 +60,9 @@ local function populate_children(handle, cwd, node, git_status)
   end
 end
 
+---@param node Node
+---@param status table
+---@return Node[]|nil
 function M.explore(node, status)
   local cwd = node.link_to or node.absolute_path
   local handle = vim.loop.fs_scandir(cwd)