### 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_NULL_V(graphics_extension, false);
	if (!running) {
		return false;
	}
	
	if (frame_state.predictedDisplayTime == 0) {
		return false;
	}
	
	if (views == nullptr || !view_pose_valid) {
		return false;
	}
	
	if (depth_views != nullptr) {
		for (uint32_t i = 0; i < view_count; i++) {
			depth_views[i].nearZ = p_z_near;
			depth_views[i].farZ = p_z_far;
		}
	}
	
	return graphics_extension->create_projection_fov(views[p_view].fov, p_z_near, p_z_far, p_camera_matrix);
}
bool OpenXRAPI::poll_events() {