Closure/callable must wrap the union/intersect return type into parenthesis when dumped

# Bug report

related with https://github.com/phpstan/phpdoc-parser/issues/74

`Closure(): (int|string)` != (`Closure(): int|string` == `(Closure(): int) | string`)

### Code snippet that reproduces the problem

https://phpstan.org/r/aa925ab2-d8b0-45e0-bd39-3568e55ead16

### Expected output

the dumped type must never parse to something else than the original