### 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.
return swapchains[OPENXR_SWAPCHAIN_COLOR].swapchain;
}
RID OpenXRAPI::get_color_texture() {
	if (swapchains[OPENXR_SWAPCHAIN_COLOR].image_acquired) {
		return graphics_extension->get_texture(swapchains[OPENXR_SWAPCHAIN_COLOR].swapchain_graphics_data, swapchains[OPENXR_SWAPCHAIN_COLOR].image_index);
	} else {
		return RID();
	}
}
RID OpenXRAPI::get_depth_texture() {
	
	if (submit_depth_buffer && swapchains[OPENXR_SWAPCHAIN_DEPTH].image_acquired) {
		return graphics_extension->get_texture(swapchains[OPENXR_SWAPCHAIN_DEPTH].swapchain_graphics_data, swapchains[OPENXR_SWAPCHAIN_DEPTH].image_index);
	} else {
		return RID();
	}
}
void OpenXRAPI::post_draw_viewport(RID p_render_target) {