Introduce multi-flush logger
Introduce multi-flush logger

Summary:
Changelog:
[Internal][Changed] - export types of performance logger

Reviewed By: rubennorte

Differential Revision: D24099293

fbshipit-source-id: 023459baa3754fb8bfaf6bf7a9061873af5756f9

pandiaraj44/react-native,myntra/react-native,arthuralee/react-native,javache/react-native,javache/react-native,javache/react-native,pandiaraj44/react-native,pandiaraj44/react-native,javache/react-native,arthuralee/react-native,myntra/react-native,myntra/react-native,myntra/react-native,janicduplessis/react-native,facebook/react-native,facebook/react-native,arthuralee/react-native,janicduplessis/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,pandiaraj44/react-native,janicduplessis/react-native,janicduplessis/react-native,pandiaraj44/react-native,pandiaraj44/react-native,facebook/react-native,myntra/react-native,janicduplessis/react-native,javache/react-native,arthuralee/react-native,javache/react-native,myntra/react-native,facebook/react-native,facebook/react-native,pandiaraj44/react-native,myntra/react-native,janicduplessis/react-native,myntra/react-native,pandiaraj44/react-native,facebook/react-native,facebook/react-native,myntra/react-native,javache/react-native,facebook/react-native,javache/react-native,arthuralee/react-native