### 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.
ERR_FAIL_COND_V(p_swapchain.image_acquired, true); 
	XrResult result;
	if (!p_swapchain.skip_acquire_swapchain) {
		XrSwapchainImageAcquireInfo swapchain_image_acquire_info = {
			XR_TYPE_SWAPCHAIN_IMAGE_ACQUIRE_INFO, 
			nullptr 
		};
		result = xrAcquireSwapchainImage(p_swapchain.swapchain, &swapchain_image_acquire_info, &p_swapchain.image_index);
		if (!XR_UNQUALIFIED_SUCCESS(result)) {
			
			frame_state.shouldRender = false;
			if (XR_FAILED(result)) {
				
				print_line("OpenXR: failed to acquire swapchain image [", get_error_string(result), "]");
				return false;
			} else {
				
				return false;
			}
		}
	}
	XrSwapchainImageWaitInfo swapchain_image_wait_info = {
		XR_TYPE_SWAPCHAIN_IMAGE_WAIT_INFO, 
		nullptr, 
		17000000 
	};
	result = xrWaitSwapchainImage(p_swapchain.swapchain, &swapchain_image_wait_info);