Add CreateNotebookInstance shortcut

[lithiumoxide]

This adds a CloudTrail event shortcut for the CreateNotebookInstance action for Sagemaker Notebooks.

While experimenting with policies to manage Sagemaker resources, I used the following in a policy for mode: cloudtrail:

      events:
        - source: sagemaker.amazonaws.com
          event: CreateNotebookInstance
          ids: 'requestParameters.notebookInstanceName'

Creating a Notebook creates an event in CloudTrail, which contains the following:

    "requestParameters": {
        "notebookInstanceName": "c7n-conor-test-5",
        .....
    },

My Cloud Custodian policy successfully finds the resource, outputting this to CloudWatch logs:

[INFO]	2022-08-24T09:53:45.039Z	157f4a60-671e-4a08-9f1e-8e7587297905	Found resource ids:['c7n-conor-test-5']

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[thisisshi]

Hi @lithiumoxide thanks for the contribution, at this time we don't typically add additional shortcuts unless it's something that's widely used, for instance the last short cut that was added was 4 years ago for lambda CreateFunction