As an enhancement to https://github.com/localstack/localstack/pull/1194

It would be really helpful to send the Lambda name, either as data, a header, or as part of the URL.

At code location: https://github.com/localstack/localstack/blob/03c6f4bf250edd18eb818ed65090f508636b0bff/localstack/services/awslambda/lambda_api.py#L696

I can likely open a PR to handle this given some feedback on the feature and potential design.

Right now all I see is the following (using `npx http-echo-server`):
```
[socket#8] event: data
--> POST / HTTP/1.1
--> Host: 192.168.1.x:3000
--> User-Agent: python-requests/2.22.0
--> Accept-Encoding: gzip, deflate
--> Accept: */*
--> Connection: keep-alive
--> Content-Length: 9
--> Content-Type: application/x-www-form-urlencoded
-->
-->
[socket#8] event: data
--> Name=test
```
if error and not dlq_sent:
                
                
                
                return
            sqs_client = aws_stack.connect_to_service('sqs')
            entries = [{'Id': r['receiptHandle'], 'ReceiptHandle': r['receiptHandle']} for r in records]
            sqs_client.delete_message_batch(QueueUrl=queue_url, Entries=entries)
        records = []
        for msg in messages:
            records.append({
                'body': msg['Body'],
                'receiptHandle': msg['ReceiptHandle'],
                'md5OfBody': msg['MD5OfBody'],
                'eventSourceARN': queue_arn,
                'eventSource': lambda_executors.EVENT_SOURCE_SQS,
                'awsRegion': region,
                'messageId': msg['MessageId'],