Add support for contact and license

[joolfe]

In openApi there are a section for contacts and for servers, review if there exist something in postman or add it by opts

[joolfe]

I mean "contact" and "license" fields.

[joolfe]

There is no correct place to put this info inside the Postman collection, so the first idea is just to let customer pass inside the info option, and maybe we can use postman variables as the version...