RFE: Allow turning off generation of sample role when creating new collections

[transcaffeine]

ISSUE TYPE

Users which intend to create a collection for (only) modules/plugins might not desire having a run sample role generated which they need to remove again. This should be customizable

SUMMARY

Currently, ansible-creator creates a scaffold-role called run in a new collection everytime. I propose being able to turn this on/off (using a flag like --(no-)create-sample-role, and adding a corresponding --(no-)create-sample-module

[cidrblock]

I'm on the fence here..... if we open the door for add/remove of different aspects of the collection it could get out of hand with endless CLI options.

That said, if this gets additional feedback b/c the role is commonly deleted, a PR would certainly be welcome prior to the team prioritizing it