rework reflection cache

[staabm]

in #716 I reworked the reflection cache so it no longer depends on PHPStan Type->__set_state to be compatible with PHPStan 2.x

the hacked implementation represents the resultset types with phpdoc and requieres some phpdoc-parsing to read this informaton back. it works but has some unnecesary overhead.

would be great we could clean this up and remove this parsing step