added feature for default networking and flexible shapes on create_no…

[HarrySnart]

Enhancement to create_notebook_session. Related to FR:1276

This enhancement adds the ability for users to use a flexible shape, by specifying ocpus and memory_in_gbs and also makes subnet_id optional. If no subnet_id is specified the notebook is provisioned with default networking. This has been unit tested locally with my own tenancy with the below tests:

from ads.catalog import notebook
notebook_catalog = NotebookCatalog(compartment_id = "ocid1...")

standard shape, specified subnet

test1 = notebook_catalog.create_notebook_session(display_name='dev-1',project_id='ocid1...',shape="VM.Standard2.1",block_storage_size_in_gbs=50,subnet_id='ocid1...')

standard shape, default netorking

test2 = notebook_catalog.create_notebook_session(display_name='dev-2',project_id='ocid1...',shape="VM.Standard2.1",block_storage_size_in_gbs=50)

flexible shape, specified subnet

test3 = notebook_catalog.create_notebook_session(display_name='dev-3',project_id='ocid1...',shape="VM.Standard.E4.Flex",ocpus = 2,memory_in_gbs = 16,block_storage_size_in_gbs=50,subnet_id='ocid1...')

flexible shape, default networking

test4 = notebook_catalog.create_notebook_session(display_name='dev-4',project_id='ocid1...',shape="VM.Standard.E4.Flex",ocpus = 2,memory_in_gbs = 16,block_storage_size_in_gbs=50)

All four notebook sessions have then been created successfully in my tenancy

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[VipulMascarenhas]

thanks @HarrySnart for the PR. I was checking the difference between NotebookSessionConfigurationDetails and NotebookSessionConfigDetails, and it looks it their implementation is exactly the same - not sure why it is replicated. We can just use 1 of them to avoid any confusion. Also, we can simplify the notebook config creation with something like this:

        ...
        ...
        # build configuration kwargs
        config_kwargs = dict(
            shape=shape,
            block_storage_size_in_gbs=block_storage_size_in_gbs,
        )
        if subnet_id:
            config_kwargs["subnet_id"] = subnet_id
        if private_endpoint_id:
            config_kwargs["private_endpoint_id"] = private_endpoint_id
         if ocpus is not None and memory_in_gbs is not None:
            config_kwargs["notebook_session_shape_config_details"] = NotebookSessionShapeConfigDetails(ocpus=ocpus, memory_in_gbs=memory_in_gbs)

        # single config object
        notebook_cfg = NotebookSessionConfigurationDetails(**config_kwargs)

        # create request details
        create_notebook_details = CreateNotebookSessionDetails(
            display_name=display_name,
            project_id=project_id,
            compartment_id=self.compartment_id,
            notebook_session_configuration_details=notebook_cfg,  
        )
        try:
            create_notebook_response = self.ds_client.create_notebook_session(...
       ...
       ...