Pass Device Addr (IP:Port) to JRTC Apps

[doctorlai-msrc]

This PR passes the ip:port/device-id from deployment yaml to the jrtc app env context. This PR also adds assertions in test_apps/first_example_py to make sure these values are passed correctly.

def jrtc_start_app(capsule):
    env_ctx = get_ctx_from_capsule(capsule)
    if not env_ctx:
        raise ValueError("Failed to retrieve JrtcAppEnv from capsule")

    ## Extract necessary fields from env_ctx and make assertions
    app_name = env_ctx.app_name.decode("utf-8")
    io_queue_size = env_ctx.io_queue_size
    app_path = env_ctx.app_path.decode("utf-8")
    app_modules = env_ctx.app_modules
    app_params = env_ctx.params
    device_mapping = env_ctx.device_mapping

    ## assertions
    assert app_name == "app1", f"Unexpected app name: {app_name}"
    assert io_queue_size == 1000, f"Unexpected IO queue size: {io_queue_size}"
    assert app_path.split("/")[-1] == "libjrtc_pythonapp_loader.so", f"Unexpected app path: {app_path}"
    assert app_modules[0].decode("utf-8").split('/')[-1] == "generated_data.py", f"Unexpected first module: {app_modules[0]}"
    assert app_modules[1].decode("utf-8").split('/')[-1] == "simple_input.py", f"Unexpected second module: {app_modules[1]}"
    assert app_params[0].key.decode("utf-8") == "python", f"Unexpected app parameter key: {app_params[0].key}"
    assert app_params[0].value.decode("utf-8").split('/')[-1] == "first_example.py", f"Unexpected app parameter value: {app_params[0].value}"
    assert device_mapping[0].key.decode("utf-8") == "1", f"Unexpected device mapping key: {device_mapping[0].key}"
    assert device_mapping[0].value.decode("utf-8") == "127.0.0.1:8080", f"Unexpected device mapping value: {device_mapping[0].value}"

This PR refactors the function _is_app_loaded()

1. adding more debug messages,
2. passing the parameter via Pointer to avoid copy
3. checking for NULL before calling strcmp

When app_type is "python", the python script is stored in parameters, thus this is used to check if the app has been loaded. For normal C/C++ app, the app is checked via the .so which is stored in app_path.

[bradunov]

Please address my comments