Dev tooling, dependencies, linting.

[Br3nda]

HELLO! I've been working for OpenAustralia on long-overdue maintenance of the Australian fork. We actually forked before git was invented, back in SVN/CVS days, but are looking into being a bit closer to the UK edition.

I'd like to share some housekeeping and "developer quality of life" improvements upstream to you.

• linting the Perl
• versions in mise, to assist developers having the same versions of Ruby, PHP, Python, and Perl for this code (no messing with system packages)
• cpan file to record Perl dependencies.
• script to install dependencies

We hope you'll accept this.

[dracos]

Hello! Thanks for this :) Looks good.

Could install-deps be instead called bootstrap to match our use in other repos and https://github.com/github/scripts-to-rule-them-all?

I think perlcritic looks for pl/pm files automatically, so could the lines that run that, run perlcritic scripts search instead? Otherwise it feels like it's going to produce a lot more output than we'd want :)