Add client CLI version in stderr

## Why
In order to help debugging of the client CLI, we need to display the version used in the stderr output (which is used for machine to machine logs).

## What
Display the client CLI version as the first entry in the stderr output of the commands.

## How

- [x] Add an entry with the version of the client CLI in the stderr output
- [x] Make it available for all the commands of the CLI