Update event for `createBucket`

[dtbuchholz]

The existing event MachineInitialized(address machineAddress) will change to event MachineInitialized(uint8 indexed kind, address machineAddress) on the next testnet release

See recallnet/contracts#83

[dtbuchholz]

note: the sdk package will only work with recallnet/ipc@571bca5 (the current testnet), but will fail if you try to use commits after this (e.g., when running localnet). once we close this issue, the inverse would happen—so we need either time this correctly, or set up a prerelease version