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# Type of request: This is a ...

[ ] bug report
[X ] feature request

# Detailed description

I'm using localstack to create a dynamoDb table locally with a dynamodb stream and a flink application consuming data from the stream
The shardId created in localstack follows this format

shardId-000000000000-798cedd84a2953c5af70a131f8701f35

Flink expects this format
shardId-00000001592367572726-07776efd

The difference is just after the prefix shardId.
Normally the real shardId created by amazon use is composed by shardId prefix, 20-digit timestamp and 0-36 or more characters separated by '-'

The current shardId format is not valid for flink applications and it's not following the real pattern used by amazon

## Expected behavior

ShardId must follow the pattern
shardId prefix, 20-digit timestamp and 0-36 or more characters separated by '-'

## Actual behavior

The shardId follows the pattern
shardId prefix, 12 0s and 33 characters separated by '-'

# Steps to reproduce

Create a dynamodb table

## Command used to start LocalStack

I'm using docker and docker compose to run localstack


## Client code (AWS SDK code snippet, or sequence of "awslocal" commands)

aws --endpoint-url=http://localhost:4566 dynamodb create-table \
    --table-name temp4 \
    --attribute-definitions AttributeName=partition_key,AttributeType=S AttributeName=sort_key,AttributeType=S \
    --key-schema AttributeName=partition_key,KeyType=HASH AttributeName=sort_key,KeyType=RANGE \
    --provisioned-throughput ReadCapacityUnits=100,WriteCapacityUnits=100 \
    --stream-specification StreamEnabled=true,StreamViewType=NEW_AND_OLD_IMAGES


dynamodb = aws_stack.connect_to_service('dynamodb')
                table_name = table_name_from_stream_arn(stream['StreamArn'])
                stream_name = get_kinesis_stream_name(table_name)
                stream_details = kinesis.describe_stream(StreamName=stream_name)
                table_details = dynamodb.describe_table(TableName=table_name)
                stream['KeySchema'] = table_details['Table']['KeySchema']
                
                
                stream_shards = stream_details['StreamDescription']['Shards']
                for shard in stream_shards:
                    shard['ShardId'] = shard_id(stream_name, shard['ShardId'])
                stream['Shards'] = stream_shards
                break
        if not result:
            return error_response('Requested resource not found', error_type='ResourceNotFoundException')
    elif action == '%s.GetShardIterator' % ACTION_HEADER_PREFIX:
        
        stream_name = stream_name_from_stream_arn(data['StreamArn'])
        stream_shard_id = kinesis_shard_id(data['ShardId'])
        result = kinesis.get_shard_iterator(StreamName=stream_name,
            ShardId=stream_shard_id, ShardIteratorType=data['ShardIteratorType'])
    elif action == '%s.GetRecords' % ACTION_HEADER_PREFIX:
        kinesis_records = kinesis.get_records(**data)
        result = {'Records': [], 'NextShardIterator': kinesis_records.get('NextShardIterator')}
        for record in kinesis_records['Records']:
            result['Records'].append(json.loads(to_str(record['Data'])))
    else:
        print('WARNING: Unknown operation "%s"' % action)
    return jsonify(result)
def error_response(message=None, error_type=None, code=400):