ROS2-like CLI for iceoryx2

[orecham]

Brief feature description

A ROS2-like CLI enabling users to interact with iceoryx2 from the terminal would be a useful addition for users to aid development of applications.

Detailed information

An summary of the capabilities of the ROS 2 CLI can be found here. NOTE: The iceoryx2 does not need to necessarily provide all of the same functionality, this should just be taken as inspiration for what could be useful.

Proposal for initial for CLI functionality:

1. introspect - introspect the internals of the iceoryx2 system (e.g. things stored in shared memory)
2. processes - manage processes running iceoryx2
3. pub - publish to the iceoryx2 system from the terminal
4. rpc - execute iceoryx2 rpc operations from the terminal
5. services - manage the services currently available in iceoryx2
6. sub - subscribe to the iceoryx2 system from the terminal

Tasks

Follow up from #106:

1. Address TODOs in commands.rs
2. Ensure implementation of commands.rs follows Rust conventions
3. Display installed commands before development commands
4. Work out how to test command lookup in file system
5. Add iceoryx2-cli to internal/scripts/crates_io_publish_script.sh to release it.

Follow up from #371:

1. Factor out CLI setup into common lib: [#98] add iox2 services cli #371 (comment)
   1. Moved to: Factor out commonalities of CLI setup into lib #412

[orecham]

@elBoberido @elfenpiff I would like to close this issue now that we have the foundation for the CLI tooling. What do you think?

We can add new issues as we think of use-cases. I can only think of one more obvious one at the moment (memory introspection, maybe an iox2 memory command). Not sure if the existing API makes this easy to do yet though.

I would also make this open action item a separate issue: Factor out CLI setup into common lib

[elBoberido]

@orecham agreed, go ahead