PARIS – Lady Gaga and French-Malian singer Aya Nakamura joined dancers, an opera diva and even a heavy metal band in an opening ceremony for the Paris Olympics that sought to proudly showcase French culture with a modern twist.The first-ever opening ceremony held outside a stadium — on the River Seine — had to battle driving rain that cast a pallid gloom over the City of Light.The fast-moving and multi-location ceremony masterminded by acclaimed French theatre director Thomas Jolly was aimed at impressing the global TV audience as much as those who braved the weather and intense security…