[FEATURE] Add config boolean to make styles file optional

[chaoticbear]

Proposal

The current plop generator includes a styles template, which is great for many group's workflows.

In our case we are going with a one export per file approach for our styled components and the initial default file doesn't make sense. Since none of the current options seem to disable creating that file we've added that feature here.

Usage

By default the style file is still created and the config option is not required to exist in the list.

To disable the style file creation, add the following to the plop file atomicGenerator config:

createStyles: false,

[chaoticbear]

@ahoendgen Here's another PR for disabling the style.ts file. Let me know if you have any feedback or need any changes here.