feat: add lua_ls completion for AstroNvim core plugins

lua/plugins/lsp.lua

@@ -3,6 +3,7 @@ if true then return {} end -- REMOVE THIS LINE TO ACTIVATE THIS FILE
 -- AstroLSP allows you to customize the features in AstroNvim's LSP configuration engine
 return {
   "AstroNvim/astrolsp",
+  ---@type AstroLSPOpts
   opts = {
     -- Diagnostics configuration (for vim.diagnostics.config({...})) when diagnostics are on
     diagnostics = {