Union types need brackets

Even simple union types require brackets (e.g. `(number|undefined)`) without brackets there is a warning.

```js
/**
* @type {{
* age: number|undefined, // WARNING - [JSC_TYPE_PARSE_ERROR] Bad type annotation.
* }}
*/
const person = {}
```

It would be nice to have support for the good old simple bracketless syntax`number|undefined`.

Compiler Version: v20221102

Build command:
```
java -jar ./scripts/closureCompiler.jar \
--entry_point=./src/js/index.js \
--js=./src/**.js \
--dependency_mode=PRUNE \
--warning_level=VERBOSE \
--js_output_file=./dist/bundle.js \
--module_resolution=WEBPACK \
--compilation_level=ADVANCED \
--jscomp_error=checkDebuggerStatement \
--jscomp_error=unusedLocalVariables \
--jscomp_error=reportUnknownTypes \
--jscomp_error=strictCheckTypes;
```