Define CyVerse REST calls to be handled by IGB REST endpoint(s)

Situation: IGBF-1635 task is to refactor how IGB endpoints work. To better understand what changes are needed in refactoring the endpoints, we need to understand what REST calls CyVerse-IGB will be making.

Task: Define all of the possible CyVerse REST calls that will need to be handled by the IGB REST endpoints. These will primarily include receiving the URL to the file and any metadata (genome and track colors), and may also involve seeing if IGB is currently open and what genomes are available.