### 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(session == XR_NULL_HANDLE, false);
	ERR_FAIL_NULL_V(graphics_extension, false);
	XrResult result;
	void *next_pointer = nullptr;
	for (OpenXRExtensionWrapper *wrapper : registered_extension_wrappers) {
		void *np = wrapper->set_swapchain_create_info_and_get_next_pointer(next_pointer);
		if (np != nullptr) {
			next_pointer = np;
		}
	}
	XrSwapchainCreateInfo swapchain_create_info = {
		XR_TYPE_SWAPCHAIN_CREATE_INFO, 
		next_pointer, 
		0, 
		p_usage_flags, 
		p_swapchain_format, 
		p_sample_count, 
		p_width, 
		p_height, 
		1, 
		p_array_size, 
		1 
	};
	XrSwapchain new_swapchain;
	result = xrCreateSwapchain(session, &swapchain_create_info, &new_swapchain);
	if (XR_FAILED(result)) {
		print_line("OpenXR: Failed to get swapchain [", get_error_string(result), "]");
		return false;
	}
	if (!graphics_extension->get_swapchain_image_data(new_swapchain, p_swapchain_format, p_width, p_height, p_sample_count, p_array_size, r_swapchain_graphics_data)) {