Add profile

[mike-potter]

Initial attempt to add a prompt for the Profile to be generated.

1. Only prompts for this if an 8.x distro version is selected (either Drupal or Octane)
2. Defaults to projectName
3. Couldn't figure out how you enter a "blank" value when specifying a default, so using "none" as the answer to skip the profile generation. There is probably a better way to do this.
4. Using two new templates in templates/profile to generate the profile.

[mike-potter]

(FYI, sorry I created this initially form the add-config-directory branch, but I removed that commit here so this isn't dependent on the other PR. Just made the commit log messier)

[grayside]

The src/config piece is just a branch for now, got it started on the idea that it wasn't ready for PR until someone adds the symlink task.

[grayside]

Also left out of the review, we should add a test case for opting into the profile and confirming the profile files are created.

[grayside]

@mike-potter various updates to the branch, please review.

The new machine name validation I did by hand, here are my test cases: https://regex101.com/r/rvbdMN/1/tests

[mike-potter]

Agree that Gruntconfig needs to be updated. Otherwise it looks good, but I didn't have time to actually run the test.

[grayside]

• [ ] Add a comment what config_install comes from.