[Feature Request] RAINBOW

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### 🚀 Feature

Implement RAINBOW (DQN + all extensions: noisy-net, double dqn, dueling, c51, prioritized experience replay).

closes #487 if it is implemented.

### Motivation

This would allow to have DQN with all extensions while keeping DQN code simple.

- [x] I have checked that there is no similar [issue](https://github.com/DLR-RM/stable-baselines3/issues) in the repo (**required**)