verdi --version can report incorrect version if package is installed in editable mode

[sphuber]

To reproduce:

1. Install aiida-core==1.4.2 in editable mode
2. verdi --version prints 1.4.2
3. Switch to aiida-core==1.4.3
4. verdi --version still prints 1.4.2

This is a problem of the @click.version_option decorator which does not dynamically inspect the linked library version but the version that was copied when it was installed.

[greschd]

(Copied from #4551 (comment))

Guess that's a limitation of importlib.metadata.version, in the master branch they added some more documentation for that: https://click.palletsprojects.com/en/master/api/#click.version_option

We should be able to get around that by simply passing version=aiida.__version__ to version_option. That might be a few milliseconds slower, but at least it'll be correct.