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
```
unzip, new_tmp_dir, short_uid, load_file, to_str, mkdir, download,
    run_safe, get_free_tcp_port, get_service_protocol, retry
)
from localstack.services.infra import start_proxy
from localstack.services.awslambda import lambda_api, lambda_executors
from localstack.services.generic_proxy import ProxyListener
from localstack.services.awslambda.lambda_api import (
    LAMBDA_RUNTIME_DOTNETCORE2, LAMBDA_RUNTIME_DOTNETCORE31, LAMBDA_RUNTIME_RUBY25, LAMBDA_RUNTIME_PYTHON27,
    use_docker, LAMBDA_RUNTIME_PYTHON36, LAMBDA_RUNTIME_JAVA8,
    LAMBDA_RUNTIME_NODEJS810, LAMBDA_RUNTIME_PROVIDED, BATCH_SIZE_RANGES, INVALID_PARAMETER_VALUE_EXCEPTION
)
from .lambdas import lambda_integration
THIS_FOLDER = os.path.dirname(os.path.realpath(__file__))
TEST_LAMBDA_PYTHON = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_integration.py')
TEST_LAMBDA_PYTHON_ECHO = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_echo.py')
TEST_LAMBDA_PYTHON3 = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_python3.py')
TEST_LAMBDA_NODEJS = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_integration.js')
TEST_LAMBDA_RUBY = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_integration.rb')
TEST_LAMBDA_DOTNETCORE2 = os.path.join(THIS_FOLDER, 'lambdas', 'dotnetcore2', 'dotnetcore2.zip')
TEST_LAMBDA_DOTNETCORE31 = os.path.join(THIS_FOLDER, 'lambdas', 'dotnetcore31', 'dotnetcore31.zip')
TEST_LAMBDA_CUSTOM_RUNTIME = os.path.join(THIS_FOLDER, 'lambdas', 'custom-runtime')
TEST_LAMBDA_JAVA = os.path.join(LOCALSTACK_ROOT_FOLDER, 'localstack', 'infra', 'localstack-utils-tests.jar')
TEST_LAMBDA_JAVA_WITH_LIB = os.path.join(THIS_FOLDER, 'lambdas', 'java', 'lambda-function-with-lib-0.0.1.jar')
TEST_LAMBDA_ENV = os.path.join(THIS_FOLDER, 'lambdas', 'lambda_environment.py')
TEST_LAMBDA_PYTHON3_MULTIPLE_CREATE1 = os.path.join(THIS_FOLDER, 'lambdas', 'python3', 'lambda1', 'lambda1.zip')
TEST_LAMBDA_PYTHON3_MULTIPLE_CREATE2 = os.path.join(THIS_FOLDER, 'lambdas', 'python3', 'lambda2', 'lambda2.zip')
TEST_LAMBDA_NAME_PY = 'test_lambda_py'
TEST_LAMBDA_NAME_PY3 = 'test_lambda_py3'
TEST_LAMBDA_NAME_JS = 'test_lambda_js'
TEST_LAMBDA_NAME_RUBY = 'test_lambda_ruby'