Add option to create-notebook to use GPUs

[ca-scribner]

Why it needs to get done

Based on the dss spec, we need notebooks that support GPUs. #31 implements the create-notebook command, but it does not include an option to enable a GPU.

What needs to get done

1. add an interface to create-notebook to enable gpus (--gpu flag? or something more detailed?)

When is the task considered done

1. create-notebook allows creation of notebooks with GPUs

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5420.

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[NohaIhab]

Note from @misohu on the implementation details of this task

[misohu]

We will get rid of the --gpu --no-gpu flags for now. The Pods have access to GPU by default after enabling the gpu addon and running correct image with drivers e.g. pytorch-cuda-full.