Add base Job class

[pprkut]

This replaces Resque\Job\JobInterface with an abstract Resque\Job\Job class. The abstract class is much more useful, as we can define the properties that we set on Jobs (which fixes deprecation warnings with PHP 8.2), as well as provide default implementation for setUp() and tearDown().

The one behavior change here is that I changed perform() from a boolean return value to void. The actual impact here is minimal, as it would only affect Jobs that chose to return false for some reason. There was no unit test for such a case, so I don't think it's a problem.