zenroom -v should terminate after version is shown

[matteo-cristino]

Now when running

zenroom -v

it prints

Zenroom v4.42.0 - secure crypto language VM
Zenroom is Copyright (C) 2017-2024 by the Dyne.org foundation

but then it does not terminate and the user has to interrupt it manually.

[matteo-cristino]

Whops, the -v option is not for version, but it is a direct call for input validation. Then it should fail and report the problem if no input is given.

Moreover an option to get zenroom version can be added.