[native] Introduce PersistedStateGate component

Summary: Introduce PersistedStateGate component, that is similar to `PersistedGate, but also waits for SQLite to load data.

Test Plan: Tested the component with Socket inside, and it seemed to work correctly on virtual iOS device.

Reviewers: palys-swm, ashoat

Reviewed By: palys-swm, ashoat

Subscribers: benschac, ashoat, Adrian, atul, karol-bisztyga, boristopalov

Differential Revision: https://phabricator.ashoat.com/D2658