[DataLoade2] Add restore_iteration to ReadingService method for arbitrary checkpointing

[NivekT]

Stack from ghstack:

• [DataLoader2] Adding support for naive snapshotting #915
• -> [DataLoade2] Add restore_iteration to ReadingService method for arbitrary checkpointing #1056
• [DataLoader2] Saving and restoring initial seed generator #998

Differential Revision: D43644874

[NivekT]

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[NivekT]

Closing. Feel free to re-open if someone else would like to work on this.