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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


aws_stack.create_dynamodb_table(
            TEST_DDB_TABLE_NAME_4,
            partition_key=PARTITION_KEY,
            stream_view_type='NEW_AND_OLD_IMAGES'
        )
        table = self.dynamodb.Table(TEST_DDB_TABLE_NAME_4)
        expected_arn_prefix = 'arn:aws:dynamodb:' + aws_stack.get_local_region()
        self.assertTrue(table.table_arn.startswith(expected_arn_prefix))
        self.assertTrue(table.latest_stream_arn.startswith(expected_arn_prefix))
        # cl
        delete_table(TEST_DDB_TABLE_NAME_4)
    def test_multiple_update_expressions(self):
        dynamodb = aws_stack.connect_to_service('dynamodb')
        aws_stack.create_dynamodb_table(TEST_DDB_TABLE_NAME, partition_key=PARTITION_KEY)
        table = self.dynamodb.Table(TEST_DDB_TABLE_NAME)
        item_id = short_uid()
        table.put_item(Item={PARTITION_KEY: item_id, 'data': 'foobar123 ✓'})
        response = dynamodb.update_item(TableName=TEST_DDB_TABLE_NAME,
            Key={PARTITION_KEY: {'S': item_id}},
            UpdateExpression='SET attr1 = :v1, attr2 = :v2',
            ExpressionAttributeValues={
                ':v1': {'S': 'value1'},
                ':v2': {'S': 'value2'}
            })
        self.assertEqual(response['ResponseMetadata']['HTTPStatusCode'], 200)
        item = table.get_item(Key={PARTITION_KEY: item_id})['Item']
        self.assertEqual(item['attr1'], 'value1')
        self.assertEqual(item['attr2'], 'value2')
    def test_return_values_in_put_item(self):