Codegenerate BatchManager API under AsyncClient and Initail Interfaces for BatchManager

[joviegas]

Motivation and Context

PR similar to https://github.com/aws/aws-sdk-java-v2/pull/2666. But following are considered after design reviews

1. The BatchManager Implementation will be hand written , thus we donot need codegenrated BatchFunctions and code generated Default batch Manager.
2. We will proivide batchManager() api only to AsyncClient , since returning completable future for sync Api doesnot make sense for Sync API , instead sync API can directly call send/recieve with custom BatchedRequest in its request.

Modifications

Customization

  "batchManagerSupported": true

Will result in code

1. Addition of scheduledExecutor similar to that of waiters()
2. Java code as below

    @Override
    public BatchManagerTestAsyncBatchManager batchManager() {
        return BatchManagerTestAsyncBatchManager.builder().client(this).scheduledExecutor(executorService).build();
    }

Testing

1. Added Junits
2. Also tested with SQS , made sure other service not impacted

License

• [x] I confirm that this pull request can be released under the Apache 2 license

[zoewangg]

Can we use the existing additionalBuilderMethods customization config if we are going to handwrite the sqs batch manager anyway?

https://github.com/aws/aws-sdk-java-v2/blob/master/services/s3/src/main/resources/codegen-resources/customization.config#L291

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
35.6% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud

[joviegas]

Can we use the existing additionalBuilderMethods customization config if we are going to handwrite the sqs batch manager anyway?

https://github.com/aws/aws-sdk-java-v2/blob/master/services/s3/src/main/resources/codegen-resources/customization.config#L291

These builder Methods are Static APIs on the Client , where as the BatchManager API are non-static methods which are invoked on the client , where client internally uses "this" to build batch Manager.