JavaScript files still reject a bare \u/\x in tagged templates (String.raw\usepackage) #23

PR #22 fixed this for .ts/.tsx (our tree-sitter-typescript fork 7dbdfae, fork #15 / upstream tree-sitter-typescript#353). .js/.mjs/.cjs/.jsx still use upstream tree-sitter-javascript.wasm, so const a = String.raw\\usepackage`;` in a .js file parses with an ERROR inside the template_string and loses the String.raw call edge (found in PR #22 review). Fix would be the same template-only escape token in tree-sitter-javascript, or document the limit.