Summary:
Adds a JS test suite for running jest tests against flipper headless binaries. Replaces the jq-based bash script.
Simple sanity test included for all expected top level keys in output JSON.
Reviewed By: passy
Differential Revision: D15625723
fbshipit-source-id: 5ec8e764bcdbb99d9070de704e76a5cd9d8e5dc6
