Ml2p

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* Disable network isolation for generating datasets.
* Change order in which notebooks resources are deleted.

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* Replace Sagefaker by moto sagemaker client to mock sagemaker.
* Refactor CLI commands.
* Add ml2p dataset generate command to generate datasets using the CLI.
* Add ModelDatasetGenerator class.
* Simplify how environment variables are passed to training job.
* Add ml2p-docker generate-dataset command.
* Update documentation.

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* Unpin all dependencies to stay up to date with Pallets packages.

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* Added the on-create feature to notebook servers.

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* Pinned Flask to a stable version.

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* Pinned Flask, Flask-API and click.