[NextJS] Enhanced component scaffolding

[mjarosch]

Description / Motivation

Enhance the component scaffolding ability to allow for more customization, adding folder structure and generating additional files like storybooks or test. This is an implementation for https://github.com/Sitecore/jss/issues/1240.

Testing Details

Validated that it still generates the scaffolded component. Have enhanced configuration and generation in another project.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)