### 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.
return (instance != XR_NULL_HANDLE);
}
bool OpenXRAPI::is_running() {
	if (instance == XR_NULL_HANDLE) {
		return false;
	}
	if (session == XR_NULL_HANDLE) {
		return false;
	}
	return running;
}
bool OpenXRAPI::openxr_loader_init() {
#ifdef ANDROID_ENABLED
	ERR_FAIL_COND_V_MSG(openxr_loader_library_handle != nullptr, false, "OpenXR Loader library is already loaded.");
	{
		Error error_code = OS::get_singleton()->open_dynamic_library(OPENXR_LOADER_NAME, openxr_loader_library_handle);
		ERR_FAIL_COND_V_MSG(error_code != OK, false, "OpenXR loader not found.");
	}
	{
		Error error_code = OS::get_singleton()->get_dynamic_library_symbol_handle(openxr_loader_library_handle, "xrGetInstanceProcAddr", (void *&)xrGetInstanceProcAddr);
		ERR_FAIL_COND_V_MSG(error_code != OK, false, "Symbol xrGetInstanceProcAddr not found in OpenXR Loader library.");
	}
#endif
	
	OPENXR_API_INIT_XR_FUNC_V(xrCreateInstance);
	OPENXR_API_INIT_XR_FUNC_V(xrEnumerateApiLayerProperties);
	OPENXR_API_INIT_XR_FUNC_V(xrEnumerateInstanceExtensionProperties);
	return true;
}
bool OpenXRAPI::resolve_instance_openxr_symbols() {