ENH Make entry point a standalone console script

[drewejohnson]

Is your feature request related to a problem? Please describe.
We have an entry point that lets people do thing with python -m serpentTools - https://serpent-tools.readthedocs.io/en/master/command-line.html

This might be useful, or else I assume we wouldn't have added it? Maybe a thing to remove?

Describe the solution you'd like

If we keep it, we should modify our packaging files such that you don't need to provide the python -m and can just call serpentTools from the command line and it works

See the setuptools docs for the addition of a "console script" section to pyproject.toml

[drewejohnson]

Maybe we just deprecate this functionality?

[drewejohnson]

One of the commands is list which shows the settings from the yaml file to control the parsers. But, #339 moves to deprecate that functionality so that will be one less command line tool out the way

[drewejohnson]

The other command is to-matlab which presumably relies on our toMatlab methods, which I'm in favor of deprecating - #498

so that would be two entry points down