Add a mechanism to return in a query more information

[luiseel]

The return type for any query is Promise<T>.

What we want to do here is that per Contract Client have the ability to wrap the query response into another object that has more information about the query itself and other contract related information.

interface Metadata {
  contractAddress: string;
  block: number;
}

interface QueryResponse<T> {
  meta: Metadata;
  data: T;
}

Promise<QueryResponse<T>>