RFE: Make molecule collection aware

[cidrblock]

As a user I want molecule to be aware that my scenarios are contained within an ansible collection.

Use cases:

• Provide the collection name to the user for use in ansible content, e.g. molecule_collection_name. This may be used in task names, debugging, etc and will avaoid the need for every user to parse the galaxy.yml file
• Will allow for the introduction of shared resources between scenarios within the same collection. See follow up RFEs