Function for_each_event_dimension 

pub fn for_each_event_dimension(
    sender: SuiAddress,
    effects: &TransactionEffects,
    events: Option<&TransactionEvents>,
    f: impl FnMut(u32, IndexDimension, &[u8]),
)

Visit all event-space dimensions for a transaction.

The callback is invoked as f(event_idx, dimension, key) once per logical event-space dimension candidate, where key is the encoded value bytes for that dimension (the lookup key, without the dimension’s tag byte prefix).

Like for_each_transaction_dimension, this keeps the ownership boundary inside the visitor call so compound event keys can borrow a reused scratch buffer while the caller consumes each value synchronously.

Every real event also yields one IndexDimension::EventExtant candidate (a singleton existence marker keyed by a placeholder byte) at its own event_idx.