add support for FBT

Created by: barakd

Facebook FBT translations library seems very promising. I was wondering if we can somehow add optional support to it in create-react-app projects, Right now in order to use a project must be ejected in order to add the proper babel configuration. If that's something you find reasonable to support, I'll be more than happy to write a PR for it given the right guidance on how you would approach adding such a support. I wonder if we can come up with something similar to relay-macros solution. Thanks