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/diagnostics.lua

@@ -12,6 +12,7 @@ local severity_levels = {
   Hint = 4,
 }
 
+---@return table
 local function from_nvim_lsp()
   local buffer_severity = {}
 
@@ -36,10 +37,14 @@ local function from_nvim_lsp()
   return buffer_severity
 end
 
+---@param severity integer
+---@param config table
+---@return boolean
 local function is_severity_in_range(severity, config)
   return config.max <= severity and severity <= config.min
 end
 
+---@return table
 local function from_coc()
   if vim.g.coc_service_initialized ~= 1 then
     return {}