Create Block: Add automated tests to scaffold

Is your feature request related to a problem? Please describe. In order to encourage users to write automated tests, the infrastructure for them should be included in the scaffold from create-block

Describe the solution you'd like Add an option for the esnext template that sets up automated tests that defaults to Y.

Describe alternatives you've considered The main alternative is documentation on how to add automated tests. While I think that's a good first step, scaffolding will ultimetely save time. Create-block is installed 70 times a week right now, if we save 5 minutes for each of those people, almost 6 hours a week will be saved. Across an entire year, that is over 12 days of time.

I also considered making it mandatory, but allowing it to be opted out makes sense to me since there is the possibility that someone may have no interest in automated tests or intends to structure them in a different way.