Interop: consolidate op-supervisor and op-geth types

[protolambda]

Op-geth contains an interoptypes package: https://github.com/ethereum-optimism/op-geth/tree/optimism/core/types/interoptypes
These types are a smaller subset of the op-supervisor types. Only what is needed to run the extract the dependencies from a list of log-events, and run the check-messages API.

The Identifier and SafetyLevel types are duplicate.

• Identifier, can be moved into op-geth, and then in the op-supervisor types package we can set a Go type alias: type Identifier = interoptypes.Identifier
• SafetyLevel could also be moved in the same way as the above, but maybe there's a more lean API we can use, that doesn't require a safety-level to be specified.