Deprecate outdated CLI

[laurenyu]

The CLI that's offered in this repository was more of a proof of concept than a finished product, and hasn't been updated since. Let’s remove the CLI code entirely for now since it doesn't seem like anyone's using it, and this will give us a clean slate for a new-and-improved CLI in the future.

[BenHamm]

Forgive me if this question flows from a misunderstanding of the CLI, but I am presently reliant upon the CLI for Sagemaker Neo optimization for raspberry pi, along the lines that Julien Simon laid out here: https://aws.amazon.com/blogs/aws/amazon-sagemaker-neo-train-your-machine-learning-models-once-run-them-anywhere/

This doesn't work with the SDK, so if you deprecate the CLI without updating the SDK to support all target instance families, you're going to break that functionality.

[laurenyu]

@BenHamm sorry for the confusion. I wasn't referring to the AWS CLI, which is what's used in the blog post you linked.

There's an experimental CLI in this SageMaker Python SDK repo: https://github.com/aws/sagemaker-python-sdk/tree/master/examples/cli. We have some longer-term plans to introduce a new-and-improved version, which is why we're hoping to deprecate the existing version and start later with a clean slate.