### 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 (!can_render()) {
		return;
	}
	for (OpenXRExtensionWrapper *wrapper : registered_extension_wrappers) {
		wrapper->on_post_draw_viewport(p_render_target);
	}
};
void OpenXRAPI::end_frame() {
	XrResult result;
	ERR_FAIL_COND(instance == XR_NULL_HANDLE);
	if (!running) {
		return;
	}
	if (frame_state.shouldRender && view_pose_valid && !swapchains[OPENXR_SWAPCHAIN_COLOR].image_acquired) {
		print_line("OpenXR: No viewport was marked with use_xr, there is no rendered output!");
	}
	
	
	
	
	if (!frame_state.shouldRender || !view_pose_valid || !swapchains[OPENXR_SWAPCHAIN_COLOR].image_acquired) {
		
		XrFrameEndInfo frame_end_info = {
			XR_TYPE_FRAME_END_INFO, 
			nullptr,