refactor: optimizing extends and implements

[jmjoy]

This pull request includes significant refactoring and improvements to the phper/src/classes.rs file. The changes primarily focus on simplifying the handling of zend_class_entry pointers by introducing the InnerClassEntry enum and updating related structures and methods accordingly.

Key changes include:

Refactoring of zend_class_entry Handling:

• Introduced InnerClassEntry enum to encapsulate zend_class_entry pointers and names, replacing the previous use of Rc<RefCell<*mut zend_class_entry>> and Option<String>. [1] [2]
• Updated StateClass and Interface structs to use InnerClassEntry for managing zend_class_entry pointers and names. [1] [2]
• Modified methods in StateClass and Interface to handle the new InnerClassEntry structure, including from_name, null, bind, and as_class_entry. [1] [2]

Simplification of Interface Extensions:

• Simplified the InterfaceEntity struct by changing the extends field to directly store Interface instances instead of boxed closures.
• Updated the extends method in InterfaceEntity to push Interface instances directly.
• Adjusted the binding logic in InterfaceEntity to use the updated Interface structure for class implementations.

Miscellaneous:

• Consolidated use statements for ptr module in phper/src/classes.rs.

[jmjoy]

Find a clever solution to #195 : prevent the StateClass created by from_name from calling the new_object method