Feature: group reports

[chrisdicaprio]

Goal: we want to classify reports by year and/or model release cycle to make them easy to find by users
Approach: we will have an agnostic approach to how the classification works by supporting groups and sub-groups in the kororaa API. The /ScienceReports will then be structured as:

Group1
|_ Group1.a
|_ Group1.b

Group2
|_ Group2.a

Each group and subgroup will consist of a list of tiles expandable and collapsible by clicking the title. All lists will start in the collapsed state.

See GNS-Science/kororaa-graphql-api#82