implement a notification notification="some-email@domain.com" to the stepfunctionsworkflow

[vincentclaes]

    # We instantiate a step functions workflow and orchestrate the glue jobs.
    with StepfunctionsWorkflow(datajob_stack=datajob_stack, name="workflow", notification="some-email...") as sfn:
        task1 >> task2

• if we define a notification we create an SNS to add to the pipeline
• it accepts an email address as string or a list of email addresses
• it notifies in case of failure or in case of success