* supervisor: Early start of RPC

* op-supervisor: Add supervisor_superRootAtTimstamp RPC

Add a new RPC to get the super root at a given timestamp.

* op-supervisor: add chainID to SuperRootResponse

* op-supervisor: fix comment

* op-supervisor: Add super root to response

* return stubbed canonical output for interop_pendingOutputV0AtTimestamp

* add ref to reorg PR

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Co-authored-by: Adrian Sutton <adrian@oplabs.co>