### 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 (Engine::get_singleton()->is_editor_hint() && p_check_run_in_editor) {
		
		return false;
	} else {
		if (XRServer::get_xr_mode() == XRServer::XRMODE_DEFAULT) {
			return GLOBAL_GET("xr/openxr/enabled");
		} else {
			return XRServer::get_xr_mode() == XRServer::XRMODE_ON;
		}
	}
}
String OpenXRAPI::get_default_action_map_resource_name() {
	String name = GLOBAL_GET("xr/openxr/default_action_map");
	return name;
}
String OpenXRAPI::get_error_string(XrResult result) {
	if (XR_SUCCEEDED(result)) {
		return String("Succeeded");
	}
	if (instance == XR_NULL_HANDLE) {
		Array args;
		args.push_back(Variant(result));
		return String("Error code {0}").format(args);
	}
	char resultString[XR_MAX_RESULT_STRING_SIZE];
	xrResultToString(instance, result, resultString);
	return String(resultString);
}
String OpenXRAPI::get_swapchain_format_name(int64_t p_swapchain_format) const {