feat: offer to add default urls for quickstart

[as-herzog]

Description

Add prompts to update an application's allowed urls to include localhost:3000 after downloading quickstart.

No prompt if the URLs have already been added

• Add prompts for adding url
• Check if urls already exist before prompting

References

#128

Testing

Describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

Please include any manual steps for testing end-to-end or functionality not covered by unit/integration tests.

Also include details of the environment this PR was developed in (language/platform/browser version).

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[woloski]

I would make it a single question for the three props

[jfatta]

I left a minor suggestion inline, then 📦