Summary:
In this diff, it moves the codegen output location out of node_modules and to build/generated/ios folder.
A temp pod spec will be created so that those files will be included in the Xcode project.
Changelog: [Internal]
Reviewed By: hramos, cortinico
Differential Revision: D31809012
fbshipit-source-id: ba1c884c8024306ba0fd2102837b7dbebc6e18ac