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(result_data['event'], json.loads('{}'))
    def test_python3_runtime_multiple_create_with_conflicting_module(self):
        original_do_use_docker = lambda_api.DO_USE_DOCKER
        try:
            
            lambda_api.DO_USE_DOCKER = False
            python3_with_settings1 = load_file(TEST_LAMBDA_PYTHON3_MULTIPLE_CREATE1, mode='rb')
            python3_with_settings2 = load_file(TEST_LAMBDA_PYTHON3_MULTIPLE_CREATE2, mode='rb')
            lambda_name1 = 'test1-%s' % short_uid()
            testutil.create_lambda_function(func_name=lambda_name1,
                                            zip_file=python3_with_settings1,
                                            runtime=LAMBDA_RUNTIME_PYTHON36,
                                            handler='handler1.handler')
            lambda_name2 = 'test2-%s' % short_uid()
            testutil.create_lambda_function(func_name=lambda_name2,
                                            zip_file=python3_with_settings2,
                                            runtime=LAMBDA_RUNTIME_PYTHON36,
                                            handler='handler2.handler')
            result1 = self.lambda_client.invoke(FunctionName=lambda_name1, Payload=b'{}')
            result_data1 = result1['Payload'].read()
            result2 = self.lambda_client.invoke(FunctionName=lambda_name2, Payload=b'{}')
            result_data2 = result2['Payload'].read()
            self.assertEqual(result1['StatusCode'], 200)
            self.assertIn('setting1', to_str(result_data1))
            self.assertEqual(result2['StatusCode'], 200)
            self.assertIn('setting2', to_str(result_data2))
            
            testutil.delete_lambda_function(lambda_name1)
            testutil.delete_lambda_function(lambda_name2)
        finally: