A single private log's log_data as surfaced by get_last_tx_effects: the first field is
the kernel-siloed tag and the remainder is the ciphertext payload.
Returns the raw offchain effect payloads emitted by the last top-level call into TXE.
Each effect is a variable-length field array (e.g. offchain messages have a different size
than authwit authorization requests).
The TXE oracle version constants are used to check that the oracle interface used for tests is in sync between
TXE and Aztec.nr. This is separate from the contract oracle version in
oracle::version, which covers oracles used during contract execution by PXE.