This change fixes up some issues with our typing and some issues exposed by adding typing: - In our review request data templates, the initial value of the `submitter` link was being added to the review request, but it really only belongs on the review request draft. - Added the url field to the review group resource data definition. - The types for several things inside the review request attributes were incorrect (should have been ResourceLink[] instead of string[] or ReviewRequest[]). - Types throughout the review request fields implementation had some errors, especially typing for methods. Testing Done: Ran js-tests.