the coin object to be merged, this coin will be destroyed, the balance will be added to
primary_coin
Optional
gasgas object to be used in this transaction, node will pick one from the signer's possession if not provided
the gas budget, the transaction will fail if the gas cost exceed the budget
the coin object to merge into, this coin will remain after the transaction
the transaction signer's Sui address
Create an unsigned transaction to merge multiple coins into one coin.