Make MobileConfig plugin exportable
Make MobileConfig plugin exportable

Summary: As per title, this diff makes the Mobile config plugin exportable. This involves moving the important property from `State` to `PersistedState`. Also had to implement the `exportPersistedState` function to fetch the experiments information for the Universes, configs and gatekeeper information.

Reviewed By: danielbuechele

Differential Revision: D17633986

fbshipit-source-id: 604225ba47112620bee0a6c704416b3ac350de9c

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