Add API to register cookie documentation

[PriyaBhatia0210]

We should automatically generate a document of all cookies registered on the site.

Acceptance Criteria:

• [ ] A way to register cookies
• [ ] Name of the cookie
• [ ] Human readable description
• [ ] Duration of cookie
• [ ] Categorization
• [ ] All registered cookies should be displayed on the cookie policy page

[rmccue]

Marking this as a won't do for now.