add a cli argument to display the version

[tonyfast]

closes #147

[bollwyvl]

We might not even need a short flag for --version.

Often -v is reserved for --verbose, and might be nice to reserve for future work.

I would intend to use this downstream to catch packaging issues with a "black box" invocation like:

importnb --version | grep -iE "importnb {{ version.replace('.', '\.') }}$"

Related to the as-of-yet untriaged [extras] item from #146: since pip check doesn't care about extras (last i checked), perhaps --version (or --versions) could also print out all of the versions of the packages it would use, if asked:

                importnb        2023.11.3

available optional dependencies:

    [doit]      doit            0.36.0
    [ipython]   IPython         8.17.2
    [toml]      tomli           2.0.1
    [yaml]      ruamel.yaml     0.18.5

missing optional dependencies:

    no missing optional dependencies:

With a "fail" condition like:

missing optional dependencies:

    [yaml]      To enable importnb.YAML:

                pip install importnb[yaml] 

[tonyfast]

i'll think about adding the extra dependency version in another PR i think.

[bollwyvl]

Pushed using the the built-in action="version", and re-ran the formatters... also added formatters to ci: it won't cause a ❌ , and can be used directly as a file with e.g. git apply

https://github.com/deathbeds/importnb/actions/runs/6755482914?pr=148#summary-18363953813

[bollwyvl]

[tonyfast]

Hell yea! Thanks for adding ruff. Was afraid to open that box and see how bad the formatting might be.

[bollwyvl]

Welp it's definitely just the "safely"-fixable stuff... I'm sure it would have some complaints if given full agency...