### Godot version

4.2 247c354

### System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

### Issue description

#75778 exposed `_validate_property()` to scripting. It's implemented in GDScript and C#, but not GDExtension (depends on #78634).
https://github.com/godotengine/godot/blob/247c3548d810136ffe9c1694cd76db3236efaa90/core/object/script_language_extension.h#L685-L687

Relevant discussion: https://github.com/godotengine/godot/pull/75778#discussion_r1307294940

### Steps to reproduce

1. Add GDExtension script
2. Use `_validate_property()`

### Minimal reproduction project

N/A
*/
typedef GDExtensionScriptInstanceDataPtr (*GDExtensionInterfaceObjectGetScriptInstance)(GDExtensionConstObjectPtr p_object, GDExtensionObjectPtr p_language);
/**
 * @name classdb_construct_object
 * @since 4.1
 *
 * Constructs an Object of the requested class.
 *
 * The passed class must be a built-in godot class, or an already-registered extension class. In both cases, object_set_instance() should be called to fully initialize the object.
 *
 * @param p_classname A pointer to a StringName with the class name.
 *
 * @return A pointer to the newly created Object.
 */
typedef GDExtensionObjectPtr (*GDExtensionInterfaceClassdbConstructObject)(GDExtensionConstStringNamePtr p_classname);
/**
 * @name classdb_get_method_bind
 * @since 4.1
 *
 * Gets a pointer to the MethodBind in ClassDB for the given class, method and hash.
 *
 * @param p_classname A pointer to a StringName with the class name.
 * @param p_methodname A pointer to a StringName with the method name.
 * @param p_hash A hash representing the function signature.
 *
 * @return A pointer to the MethodBind from ClassDB.
 */
typedef GDExtensionMethodBindPtr (*GDExtensionInterfaceClassdbGetMethodBind)(GDExtensionConstStringNamePtr p_classname, GDExtensionConstStringNamePtr p_methodname, GDExtensionInt p_hash);
/**
 * @name classdb_get_class_tag