By making the stopping loop the first loop, we can avoid using `pyo3/allow_threads`, which
seems buggy.

This commit is an initial draft at fixing #147. The error is due to the
fact that pyo3 has linked the libpython from the compilation and not
trying to use libpython that is available in `LD_LIBRARY_PATH`.

The current only solution to disable the linking is to use the `extension-module` flag.
This requires to make the python `runtime-node` packaged in a python library.
The python `runtime-node` should also be fully compatible with the other operators in case we want hybrid runtime.

The issue that i'm facing is that. Due to the packaging, I have to deal with the `GIL` that is present from the start of
`dora-runtime` node. This however makes the process single threaded wich is impossible.

So, I have to disable it, but when I do, I have a race condition:
```bash
Exception ignored in: <module 'threading' from '/usr/lib/python3.8/threading.py'>
Traceback (most recent call last):
  File "/usr/lib/python3.8/threading.py", line 1373, in _shutdown
    assert tlock.locked()
AssertionError:
```
The issue is the same as https://github.com/PyO3/pyo3/issues/1274

To fix this issue, I'm going to look again at the different step to make this work.

But this is my current investigation.

Add iceoryx binary to the $PATH

fix some typos and instructions

Implement C++ template in dora CLI

Use cache instead of downloading file each time

Co-authored-by: Philipp Oppermann <dev@phil-opp.com>

The `tokio::task::spawn_blocking` function will try to join them at the end of `main`, which hangs forever since the listener never finishes.

Use the new request/reply communcation layer and its TCP-based implementation for sending control messages from the CLI to the dora coordinator.

And a TCP-based implemenation.

Queries the list of running dataflows from the coordinator and prompts the user to choose one.

CI: Switch Rust problem matcher back to upstream

This reverts commit e5a825b11f.

Implement a C++ operator API

CI: Set up caching and update actions to fix deprecation warnings

This is particularly useful if internet is down.

The problem matcher adds compiler errors/warnings as inline annotations in the 'Files Changed' in the GitHub PR GUI.

Allow configuring the `dora up` behavior through a `dora-config.yml` file

Allow operators to stop the full dataflow

Fixes CI warning about deprecated node.js version

Fix clippy warnings

* Add getting started  section in `README`

* Update README.md

Co-authored-by: Philipp Oppermann <dev@phil-opp.com>

* Update README.md

Co-authored-by: Philipp Oppermann <dev@phil-opp.com>

* Update README.md

Co-authored-by: Philipp Oppermann <dev@phil-opp.com>

Co-authored-by: Philipp Oppermann <dev@phil-opp.com>

Useful in case of emergencies.

Make command line argument program usable as custom node source.