Add stable baselines 3 containers for sagemaker

Add [https://github.com/DLR-RM/stable-baselines3](https://github.com/DLR-RM/stable-baselines3) and [https://github.com/DLR-RM/rl-baselines3-zoo](https://github.com/DLR-RM/rl-baselines3-zoo)
container for sagemaker, so training rl models with stable baselines 3 will be possible.

Start by reviewing the repository's existing Dockerfiles and how its SageMaker reinforcement-learning containers install dependencies. Determine where Stable-Baselines3 and rl-baselines3-zoo fit, then verify that the resulting containers build and support training RL models with both libraries.

Written by the indexing model from the issue text.