CallArg:
    | { Object: ObjectArg }
    | { Pure: PureArg }
    | { UnresolvedPure: UnresolvedPureArg }
    | { UnresolvedObject: UnresolvedObjectArg }

Represents an input to a Transaction, either as a fully resolved Object or Pure input or as an unresolved partial reference which needs to be resolved before the transaction can be serialized to bcs and executed.