### 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 (openxr_api == nullptr) {
		return Array();
	} else if (!openxr_api->is_initialized()) {
		return Array();
	} else {
		return openxr_api->get_available_display_refresh_rates();
	}
}
bool OpenXRInterface::is_hand_tracking_supported() {
	if (openxr_api == nullptr) {
		return false;
	} else if (!openxr_api->is_initialized()) {
		return false;
	} else {
		OpenXRHandTrackingExtension *hand_tracking_ext = OpenXRHandTrackingExtension::get_singleton();
		if (hand_tracking_ext == nullptr) {
			return false;
		} else {
			return hand_tracking_ext->get_active();
		}
	}
}
bool OpenXRInterface::is_eye_gaze_interaction_supported() {