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
```
self.assertEqual(status, 1)
        container_network = executor.get_docker_container_network(func_arn)
        self.assertEqual(container_network, 'default')
        executor.cleanup()
        status = executor.get_docker_container_status(func_arn)
        self.assertEqual(status, 0)
        self.assertEqual(len(executor.get_all_container_names()), 0)
        
        testutil.delete_lambda_function(func_name)
    def test_docker_command_for_separate_container_lambda_executor(self):
        
        if not isinstance(lambda_api.LAMBDA_EXECUTOR,
                          lambda_executors.LambdaExecutorSeparateContainers):
            return
        executor = lambda_api.LAMBDA_EXECUTOR
        func_name = 'test_docker_command_for_separate_container_lambda_executor'
        func_arn = lambda_api.func_arn(func_name)
        handler = 'handler'
        lambda_cwd = '/app/lambda'
        network = 'compose_network'
        config.LAMBDA_DOCKER_NETWORK = network
        cmd = executor.prepare_execution(func_arn, {}, LAMBDA_RUNTIME_NODEJS810, '', handler, lambda_cwd)
        expected = 'docker run -v "%s":/var/task   --network="%s"  --rm "lambci/lambda:%s" "%s"' % (
            lambda_cwd, network, LAMBDA_RUNTIME_NODEJS810, handler)
        self.assertIn(('--network="%s"' % network), cmd, 'cmd=%s expected=%s' % (cmd, expected))
        config.LAMBDA_DOCKER_NETWORK = ''
    def test_destroy_idle_containers(self):
        
        if not isinstance(lambda_api.LAMBDA_EXECUTOR,
                          lambda_executors.LambdaExecutorReuseContainers):