[php-src] Issue #8782: Make evaled code/tokens accessible

Issue: https://github.com/php/php-src/issues/8782 Author: mvorisek ### Description Code like: ``` <?php namespace N; class Cl {} eval(<<<'EOF' use N\Cl; class U { /** * @return Cl */ public function test() { throw new \Exception(); } } EOF); ``` has unusable phpdoc, as it relies on a use N\Cl; statement. The issue is phpdoc can be accessed by reflection - https://3v4l.org/djLIA - but the full evaled code is not accessible thus the use statements required to parse the phpdoc cannot be read. At least I am unaware of any way to access the evaled code (or parsed tokens). The ability to resolve phpdoc for classes from eval is important as annotations are used by many production libs (like Doctrine ORM) and also for static analysers. This is a feature request to make the full evaled code accessible at least via new reflection ReflectionClass::getFileContents() method. If the parsed file tokens are already stored somewhere, providing a method to access the tokens instead of the file source code will be enough.