Override the models the prune command looks for

[tobytwigger]

We're wanting to use this package in a modular environment - most of our models are optional so we want to prune them if included but not if they aren't. I'd also like to define the models within the module rather than specifying them in config.

This PR lets you add an optional callback to override the config value. This will let us dynamically list the models to search for, without changing the default behaviour.

[riccardodallavia]

Hi @tobytwigger and thank you for the nice pull request!
I'd change the callback type from Closure to callable to allow non anonymous functions (as for example invokable classes)!
What do you think?

[riccardodallavia]

@tobytwigger I just updated your pull request.
Please let me know if it works for you so I can merge this!

[tobytwigger]

Looks excellent thank you, and it's working well for us locally.