EventInfo constructor Null safety
Implementation
EventInfo(this.type, this.ledger, this.ledgerCloseAt, this.contractId, this.id,
this.paginationToken, this.topic, this.value);
EventInfo(this.type, this.ledger, this.ledgerCloseAt, this.contractId, this.id,
this.paginationToken, this.topic, this.value);