chore(interop): Update Identifier ABI

[clabby]

Overview

The interop spec updates have changed the Identifier.

from:

struct Identifier {
    address origin;
    uint256 blockNumber;
    uint256 logIndex;
    uint256 timestamp;
    uint256 chainId;
}

to

struct Identifier {
    address origin;
    uint64 blockNumber;
    uint32 logIndex;
    uint64 timestamp;
    uint256 chainId;
}

[clabby]

I'll get this done before EOW.

[clabby]

I don't think they actually ended up changing this. Will close this week once I've confirmed with wonderland.