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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


""" List event source mappings
        ---
        operationId: 'listEventSourceMappings'
    """
    event_source_arn = request.args.get('EventSourceArn')
    function_name = request.args.get('FunctionName')
    mappings = event_source_mappings
    if event_source_arn:
        mappings = [m for m in mappings if event_source_arn == m.get('EventSourceArn')]
    if function_name:
        function_arn = func_arn(function_name)
        mappings = [m for m in mappings if function_arn == m.get('FunctionArn')]
    response = {
        'EventSourceMappings': mappings
    }
    return jsonify(response)
@app.route('%s/event-source-mappings/<mapping_uuid>' % PATH_ROOT, methods=['GET'])
def get_event_source_mapping(mapping_uuid):