### 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
* @param p_instance A pointer to a FileAccess object.
 * @param p_dst A pointer to the buffer to store the data.
 * @param p_length The requested number of bytes to read.
 *
 * @return The actual number of bytes read (may be less than requested).
 */
typedef uint64_t (*GDExtensionInterfaceFileAccessGetBuffer)(GDExtensionConstObjectPtr p_instance, uint8_t *p_dst, uint64_t p_length);
/**
 * @name worker_thread_pool_add_native_group_task
 * @since 4.1
 *
 * Adds a group task to an instance of WorkerThreadPool.
 *
 * @param p_instance A pointer to a WorkerThreadPool object.
 * @param p_func A pointer to a function to run in the thread pool.
 * @param p_userdata A pointer to arbitrary data which will be passed to p_func.
 * @param p_tasks The number of tasks needed in the group.
 * @param p_high_priority Whether or not this is a high priority task.
 * @param p_description A pointer to a String with the task description.
 *
 * @return The task group ID.
 *
 * @see WorkerThreadPool::add_group_task()
 */
typedef int64_t (*GDExtensionInterfaceWorkerThreadPoolAddNativeGroupTask)(GDExtensionObjectPtr p_instance, void (*p_func)(void *, uint32_t), void *p_userdata, int p_elements, int p_tasks, GDExtensionBool p_high_priority, GDExtensionConstStringPtr p_description);
/**
 * @name worker_thread_pool_add_native_task
 * @since 4.1
 *
 * Adds a task to an instance of WorkerThreadPool.