Aggregator struct.
This struct is responsible for aggregating partial signatures from the verifiers.
It will have in total 3 * num_operator + 1 aggregated nonces.
[0] -> Aggregated nonce for the move transaction.
[1..num_operator + 1] -> Aggregated nonces for the operator_takes transactions.
[num_operator + 1..2 * num_operator + 1] -> Aggregated nonces for the slash_or_take transactions.
[2 * num_operator + 1..3 * num_operator + 1] -> Aggregated nonces for the burn transactions.
For now, we do not have the last bit.