Add eject command

[jsjoeio]

Users should be able to eject from the project. This will essentially take the templates from the project and place them in the users project directly.

This feature is complete when:
- the cli has an eject command
- it prompts the user which templates to include (multi-select)
- it adds a /_templates to the root with the templates
- the user is still able to use the scripts in their package.json which generate files/folders

This should be run with npx like so npx eb-scripts eject.