Summary:
Add QPL code to Flipper and a lightweight implementation of PigeonClient so that QPL can be integrated into Flipper and it can be used to monitor events inside Flipper.
the code was copied from VSCode from these diffs:
https://www.internalfb.com/diffs/D21271812https://www.internalfb.com/diffs/D21565279
Reviewed By: nubbel, bestander
Differential Revision: D22393607
fbshipit-source-id: 3ce77320c187f406b77321c020afc116bed45a93