Accept "Library Type" in generate-specs-cli.js
Accept "Library Type" in generate-specs-cli.js

Summary:
Currently, some filtering of generated files are done in multiple places (e.g. generate-specs-cli.js, react_native_pods.rb, etc). I am introducing this arguments so that only needed files are generated for components and modules.

Changelog: [internal]

Reviewed By: hramos, cortinico

Differential Revision: D31878098

fbshipit-source-id: d2dc8f51ea14a5d0ba1548bd481814220c9ae3a2

facebook/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,facebook/react-native,javache/react-native,javache/react-native,javache/react-native,facebook/react-native,javache/react-native,javache/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,janicduplessis/react-native,janicduplessis/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,facebook/react-native