Summary:
Currently, the tasks for downloading, expanding, and preparing Hermes to be built for Apple targets are split across the Circle CI and CocoaPods configs.
This diff sets out to consolidate these tasks into a single hermes-utils.js script that can be reused across CI and build systems.
The release script that is used to assign the Hermes tag for a given React Native version has been moved into `scripts/hermes`.
Changelog: [Internal]
Reviewed By: cortinico
Differential Revision: D36329356
fbshipit-source-id: 0222070adf201fa533b607a183471396d45c6caf
Héctor Ramos