[FEATURE] Optional dependency group for ML Commons client

[evandiewald]

Is your feature request related to a problem?
Thank you for creating this excellent project! For my use-case, I only need the ML Commons client to register and deploy pre-trained models. I am using a Lambda function to initialize an OpenSearch cluster with an embedding model, but the required dependencies of pandas, numpy, and matplotlib are too large to include the whole opensearch-py-ml library in my deployment.

What solution would you like?
The option to install a variant of the package that only requires dependencies required for the ML Commons client, e.g.
pip install opensearch-py-ml[ml-commons]

What alternatives have you considered?
The ML Commons client could be added to the opensearch-py Plugins or broken out into its own package.

Do you have any additional context?
I think this could be accomplished using setuptools Optional dependencies.

[dtaivpp]

I think this is a great idea! Actually, this could help us eventually roll this into the regular opensearch-py project. It bugs me a bit that they are separate.

[Iggaray]

I was brought here by the exact same need as @evandiewald ! Thanks for posting this feature request.