Add feature to get deployment hash and deployment result separately

[nightowl121]

During the integration tests, we often require to deploy a large set of contracts. By default, while deploying contracts we need to wait blockTime * no. of contracts. This creates a synchronous delay in integration test.

This PR allows developer to deploy all contracts, get all hashes and then wait for a single block time which helps in asynchronous deployment.

[jspark-icon]

DefaultScoreClient does not aim to support asynchronous.
To deploy asynchronously, you can use async support classes as below example.

var f1 = CompletableFuture.supplyAsync(() -> DefaultScoreClient.of(System.getProperties()));
var f2 = CompletableFuture.supplyAsync(() -> DefaultScoreClient.of(System.getProperties()));
var c1 = f1.get();
var c2 = f2.get();
//use c1, c2 codes