Make `ReflectionGenerator::getFunction()` legal after generator termination (#14167)

* Make `ReflectionGenerator::getFunction()` legal after generator termination

* Expose the gener

Make `ReflectionGenerator::getFunction()` legal after generator termination (#14167)

* Make `ReflectionGenerator::getFunction()` legal after generator termination

* Expose the generator function name via `Generator::__debugInfo()`

* Allow creating `ReflectionGenerator` after termination

* Reorder `struct _zend_generator` to avoid a hole

* Adjust `ext/reflection/tests/028.phpt`

This is legal now.

* Fix Generator Closure collection

* Add test to verify the Closure dies with the generator

* NEWS / UPGRADING

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