Override dynamoDBEnpoint

Hi,

I'm running Localstack with Kinesis and DynamoDB locally, but I still don't know how to override DynamoDB endpoint. I was looking at the kinesis application client java library, but I guess it uses the default constructor to create the DynamoDbAsyncClient instance.

`DynamoDbAsyncClient dynamoDBClient = DynamoDbAsyncClient.builder()
.credentialsProvider(DefaultCredentialsProvider.create()).build();`

Does anyone know how to do it?

The issue names no repository file or test; begin by locating where the Kinesis client creates DynamoDbAsyncClient and how endpoint configuration is exposed. Reproduce the LocalStack setup described in the issue, then verify that a configured DynamoDB endpoint is honored and cover the behavior with a focused test if the repository provides one.

Written by the indexing model from the issue text.