Fix warning about `#pragma once` in main file

Expose ROS2 constants in generated bindings (Rust and C++)

We do some manual header insertion into the ROS2 bindings `.cc` file to fix some import errors. This commit skips copying of the `#pragma once` attribute at the beginning to avoid a C++ warning.

Enables using the C++ ROS2 API independent of Dora.

Use the subscriber type for downcasting to ensure that the correct type is used. Also, store an unique ID per subscriber to differentiate subscriptions of same type after merging.

Stream merging based on the cxx crate requires the bridge and the api to share an `ExternalEvents` type, which is only possible if the two bridge modules are defined in the same crate.

Don't bind the lifetime of the event to the `next` call anymore. This makes it possible to use the original event in Python, which does not support borrowed data or lifetimes. The drawback is that we no longer have the guarantee that an event is freed before the next call to `recv`.

test new crates version release

test rc 2 version

fix version typo

Test crates.io new dora tag release

The intent of this commit is to remove the quantity of log that is being pushed to user.

This commit removes the redeclaration of a set up tracing methods to centralise
the tokio-tracing subscriber within the extension crate. It also add the
feature to filter information based on Environment variable.
This makes it possible to define the log level for tokio tracing like
this:
```
RUST_LOG=debug dora-daemon --run-dataflow dataflow.yml
```

I have also unified the feature flag to make it easier to manage tracing features among the workspace.

I did not change the default behaviour of tracing in our crates and therefore by
using the command above you should get the same tracing log as before.

fix merge conflict generated

The cxx crate is able to invoke the Rust destructors from C++

This way, we don't need to update the version manually in all sub-crates on every release.