Summary:
Pull Request resolved: https://github.com/facebook/flipper/pull/1612
* Use the QPL-managed QPLCore and PigeonClient.
**Facebook:**
js-shared/qpl and js-shared/pigeon-client are maintained by QPL in xplat/js-shared. I've updated the Metro config and tsconfig to allow the packages to be imported without breaking the open-source version.
Reviewed By: passy
Differential Revision: D24358369
fbshipit-source-id: 7f13d6c99d8ca6ebcd0e66bf0e5f25069370cce7