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
```
BatchSize=BATCH_SIZE_RANGES['sqs'][1] + 1
            )
            self.fail('This call should not be successful as the batch size > MAX_BATCH_SIZE')
        except ClientError as e:
            self.assertEqual(e.response['Error']['Code'], INVALID_PARAMETER_VALUE_EXCEPTION)
        queue_url_2 = sqs_client.create_queue(QueueName=queue_name_2)['QueueUrl']
        queue_arn_2 = aws_stack.sqs_queue_arn(queue_name_2)
        try:
            
            lambda_client.create_event_source_mapping(
                EventSourceArn=queue_arn_2,
                FunctionName=function_name,
                BatchSize=BATCH_SIZE_RANGES['sqs'][1] + 1
            )
            self.fail('This call should not be successful as the batch size > MAX_BATCH_SIZE')
        except ClientError as e:
            self.assertEqual(e.response['Error']['Code'], INVALID_PARAMETER_VALUE_EXCEPTION)
        table_arn = aws_stack.create_dynamodb_table(ddb_table, partition_key='id')['TableDescription']['TableArn']
        rs = lambda_client.create_event_source_mapping(
            EventSourceArn=table_arn,
            FunctionName=function_name
        )
        self.assertEqual(rs['BatchSize'], BATCH_SIZE_RANGES['dynamodb'][0])
        
        dynamodb_client = aws_stack.connect_to_service('dynamodb')
        dynamodb_client.delete_table(TableName=ddb_table)
        sqs_client.delete_queue(QueueUrl=queue_url_1)
        sqs_client.delete_queue(QueueUrl=queue_url_2)
        lambda_client.delete_function(FunctionName=function_name)
class TestPythonRuntimes(LambdaTestBase):