Command to download other binaries and tools

[smyrick]

Description

Rover dev is helpful to run a supergraph quickly, by first composing a supergraph for me, then downloading and passing it in to a Router binary. Sometimes though I want to do this myself and for debugging purposes I may already have a supergraph and I want to pass it to a Router.

It would also be helpful if Rover could be the one tool that GraphOS users only need and we have have them run a bunch of rover commands to debug, having everything all in one. As an example the Apollo Solutions teams uses this script in many repos: https://github.com/apollosolutions/router-playground/blob/568370fab8151c61a14b57c8b21e6c9b016daea5/download-latest.sh#L1

Implementation

rover download router should go fetch the latest Router binary and save it to my current running location, not in ~/.rover, so that I can easily invoke ./router myself.

Using the first command rover download also leaves that open for other commands in the future

• rover download router
• rover download router-config-schema
• rover download composition
• rover download query-planner
• rover download rover (to get another local copy)