* add `pip` release in release workflow

* add blank space

* Reduce Python verion to 3.7 for default conda support

* Split CI workflows to avoid name collusions

There is a name collusion issue within cargo. See: https://github.com/rust-lang/cargo/issues/6313
That make it impossible to build at the same time the `dora` cli binary,
and the `dora` python shared library.

To avoid the collusion, this commit split the two workflows:
- `main` workflows consists of default-members and is tested on `ci.yml`
- `python` workflow is on `ci-python.yaml` which is only run when python file changed.

* add root example package

* add python version

* Fix Minor pypi release issue

- Name is `dora-rs` and not `dora`
- maturin 0.13 does not have `extension-module` features built in.

* Use `--all` to check build of `dora`

As the cli name was changed to `dora-cli`, we don't have name collusion anymore and can use `--all` flags for building and testing `dora`

Fix python operator error due to non-present metadata.

This commit add an optional argument for metadata as a Python dictionnary.

The Python dictionnary instead of a class gives us more flexibility, at the cost of parsing items and casting types.

Create release artifacts on the CI

Start creating command line interface with `check`, `build`, `graph` and `templates` commands

To avoid name collision with Python package.

The executable is renamed back to `dora` in the release archive for easier usage.

Add a separate `prepare` step to publishers to allow zero copy send operations

Runs the build commands specified for the nodes and operators of a dataflow.

Use `tracing` for logging state of nodes, coordinator, and runtimes

Send metadata in messages encoded with capnproto

Fix clippy warnings across whole projects

Move communication layer implementation into separate library

Changes the message format from raw data bytes to a higher-level `Message` struct serialized with capnproto. In addition to the raw data, which is sent as a byte array as before, the `Message` struct features `metadata` field. This metadata field can be used to pass open telemetry contexts, deadlines, etc.

To make it usable for other projects.

Redesign communication layer to be synchronous and add support for iceoryx

With the previous solution, the stop channel thread sometimes panicked with 'stop stream was disconnected unexpectedly'.

We still saw some missed stop messages on the CI with the 1sec delay.

The status is required for the last commit of a PR.

Rework raw operator API on top of `safer-api` crate Allows a higher-level interface