### Godot version

4.2.dev 80de898d721f952dac0b102d48bb73d6b02ee1e8

### System information

OpenXR

### Issue description

The Godot 3 OpenXR plugin supported obtaining boundary/guardian information in order to obtain play space logic. While we do have a function in the `XRInterface` in Godot 4 that is supposed to retrieve this information (`get_play_area`) it is not implemented on the Godot 4 `OpenXRInterface`.

This logic needs to be ported.

### Steps to reproduce

Call `get_play_area`, be amazed by it not returning data :P

### Minimal reproduction project

Any XR project.
if (view_configuration_views != nullptr) {
		memfree(view_configuration_views);
		view_configuration_views = nullptr;
	}
	if (supported_view_configuration_types != nullptr) {
		memfree(supported_view_configuration_types);
		supported_view_configuration_types = nullptr;
	}
	if (supported_environment_blend_modes != nullptr) {
		memfree(supported_environment_blend_modes);
		supported_environment_blend_modes = nullptr;
		num_supported_environment_blend_modes = 0;
	}
	if (instance != XR_NULL_HANDLE) {
		for (OpenXRExtensionWrapper *wrapper : registered_extension_wrappers) {
			wrapper->on_instance_destroyed();
		}
		xrDestroyInstance(instance);
		instance = XR_NULL_HANDLE;
	}
	enabled_extensions.clear();
	if (graphics_extension != nullptr) {
		unregister_extension_wrapper(graphics_extension);
		memdelete(graphics_extension);
		graphics_extension = nullptr;
	}
}
bool OpenXRAPI::create_session() {