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/iterators/node-iterator.lua

@@ -1,6 +1,9 @@
+---@class NodeIterator
 local NodeIterator = {}
 NodeIterator.__index = NodeIterator
 
+---@param nodes Node[]
+---@return NodeIterator
 function NodeIterator.builder(nodes)
   return setmetatable({
     nodes = nodes,
@@ -15,6 +18,7 @@ function NodeIterator.builder(nodes)
   }, NodeIterator)
 end
 
+---@return NodeIterator
 function NodeIterator:hidden()
   self._filter_hidden = function(_)
     return true
@@ -22,21 +26,29 @@ function NodeIterator:hidden()
   return self
 end
 
+---@param f fun(node: Node): boolean
+---@return NodeIterator
 function NodeIterator:matcher(f)
   self._match = f
   return self
 end
 
+---@param f fun(node: Node, i: number)
+---@return NodeIterator
 function NodeIterator:applier(f)
   self._apply_fn_on_node = f
   return self
 end
 
+---@param f fun(node: Node): any
+---@return NodeIterator
 function NodeIterator:recursor(f)
   self._recurse_with = f
   return self
 end
 
+---@return Node|nil
+---@return number|nil
 function NodeIterator:iterate()
   local iteration_count = 0
   local function iter(nodes)