Add device type function for v23 SDK

[Wavesonics]

We need to be able to query the device type: The ovrDeviceType value, VRAPI_DEVICE_TYPE_OCULUSQUEST2, has been added to the API.

The upstream oculus_mobile plugin does it as such:

    inline int get_device_type() {
        return ovrmobile::get_device_type(OvrMobileSession::get_singleton_instance());
    }

    inline bool is_oculus_quest_1_device() {
        return ovrmobile::is_oculus_quest_1_device(OvrMobileSession::get_singleton_instance());
    }

    inline bool is_oculus_quest_2_device() {
        return ovrmobile::is_oculus_quest_2_device(OvrMobileSession::get_singleton_instance());
    }

ovrDeviceType get_device_type(OvrMobileSession *session) {
    return check_session_initialized<ovrDeviceType>(
            session,
            [&]() {
                auto device_type = static_cast<ovrDeviceType>(vrapi_GetSystemPropertyInt(
                        session->get_ovr_java(), VRAPI_SYS_PROP_DEVICE_TYPE));
                return device_type;
            },
            []() { return VRAPI_DEVICE_TYPE_UNKNOWN; });
}

bool is_oculus_quest_1_device(OvrMobileSession *session) {
    ovrDeviceType device_type = get_device_type(session);
    return device_type >= VRAPI_DEVICE_TYPE_OCULUSQUEST_START &&
           device_type <= VRAPI_DEVICE_TYPE_OCULUSQUEST_END;
}

bool is_oculus_quest_2_device(OvrMobileSession *session) {
    ovrDeviceType device_type = get_device_type(session);
    return device_type >= VRAPI_DEVICE_TYPE_OCULUSQUEST2_START &&
           device_type <= VRAPI_DEVICE_TYPE_OCULUSQUEST2_END;
}