fix(lsp): add luv library by default to lua_ls (#4067)

lua/lvim/lsp/providers/lua_ls.lua

@@ -5,6 +5,7 @@ local default_workspace = {
     require("neodev.config").types(),
     "${3rd}/busted/library",
     "${3rd}/luassert/library",
+    "${3rd}/luv/library",
   },
 
   maxPreload = 5000,