Ability to customize name of Lambda function

We'd like to deploy this capability, but our organization has strict object naming conventions. So we'd like to be able to use this functionality with a Lambda that is named differently than "RunNotebook."

I know I can update the [cloudformation-base.yml](https://github.com/aws-samples/sagemaker-run-notebook/blob/master/sagemaker_run_notebook/cloudformation-base.yml#L276) to change the Lambda name that is created by CloudFormation. And I see the Lambda name in the [run_notebook.py](https://github.com/aws-samples/sagemaker-run-notebook/blob/master/sagemaker_run_notebook/run_notebook.py#L612) file. But how do I re-build/re-package the extension after forking the repo?

As an alternative, it would be nice if the name of the Lambda was somehow configurable upon installation of the package/extension.