### 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.
case XR_SESSION_STATE_STOPPING:
							on_state_stopping();
							break;
						case XR_SESSION_STATE_LOSS_PENDING:
							on_state_loss_pending();
							break;
						case XR_SESSION_STATE_EXITING:
							on_state_exiting();
							break;
						default:
							break;
					}
				}
			} break;
			case XR_TYPE_EVENT_DATA_REFERENCE_SPACE_CHANGE_PENDING: {
				XrEventDataReferenceSpaceChangePending *event = (XrEventDataReferenceSpaceChangePending *)&runtimeEvent;
				print_verbose(String("OpenXR EVENT: reference space type ") + OpenXRUtil::get_reference_space_name(event->referenceSpaceType) + " change pending!");
				if (event->poseValid && xr_interface) {
					xr_interface->on_pose_recentered();
				}
			} break;
			case XR_TYPE_EVENT_DATA_INTERACTION_PROFILE_CHANGED: {
				print_verbose("OpenXR EVENT: interaction profile changed!");
				XrEventDataInteractionProfileChanged *event = (XrEventDataInteractionProfileChanged *)&runtimeEvent;
				List<RID> trackers;
				tracker_owner.get_owned_list(&trackers);
				for (int i = 0; i < trackers.size(); i++) {
					tracker_check_profile(trackers[i], event->session);
				}
			} break;