Add Numbered Id's For Policies

[noamd-legit]

RE: ID Numbers When referencing, it is much easier to reference a number, like GH-1, than a name. It also allows the policy name to change without breaking other references (see CIS benchmark example in previous comment). Like database primary/foreign keys; you want to reference the key so names and other things can change easily. When looking at most standards out there, like NIST, CIS, CSA, etc, they all reference each-other by specific numbers and not titles. See this link for one example of such a mapping. I would suggest doing the same here for both consistency and ease of reference.

Originally posted by @derekmurawsky in #139 (comment)