### 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 (running && session != XR_NULL_HANDLE) {
		xrEndSession(session);
	}
	if (graphics_extension) {
		graphics_extension->cleanup_swapchain_graphics_data(&swapchains[OPENXR_SWAPCHAIN_COLOR].swapchain_graphics_data);
	}
	if (views != nullptr) {
		memfree(views);
		views = nullptr;
	}
	if (projection_views != nullptr) {
		memfree(projection_views);
		projection_views = nullptr;
	}
	if (depth_views != nullptr) {
		memfree(depth_views);
		depth_views = nullptr;
	}
	for (int i = 0; i < OPENXR_SWAPCHAIN_MAX; i++) {
		if (swapchains[i].swapchain != XR_NULL_HANDLE) {
			xrDestroySwapchain(swapchains[i].swapchain);