Allow config and temp directories to be configured independently.

Sorry for the delay, merged! 🎉

This had the key foundations, I just had to rework some of the naming and internal API choices. Sharing a few notes:

A parameter like $isHidden isn't good, because what we want to achieve has nothing to do with hidden/non-hidden, just with automatic inference from the config name. Similarly, I removed some tests focusing on the hidden aspect.
A method like getScribeConfigurationPath() is misleading, because, even though it internally uses the configName, one of its purposes is to resolve output paths (for instance, $pathConfig->getScribeConfigurationPath('openapi.yaml')). So I split it into separate methods, so this is now $pathConfig->outputPath('openapi.yaml').
Having repeated parameters and booleans like in new PathConfig($configName, $configName, true) is often a suboptimal API, because its unclear to the reader. We can often do better. In this case, I refactored to new PathConfig($configName) (since the others depend on the first, by default). For cases of multiple arguments, we can use PHP 8's named arguments to make it clearer:
```
- new PathConfig($configName, $this->option('scribe-dir'));
+ new PathConfig(configName: $configName, scribeDir: $this->option('scribe-dir'))
```
It was a good idea to create a base test method (in the OutputTest), and have a bunch of test methods call it. However, the exposed API was quite noisy. Rather than having $this->base(['--a' => 'aa', '--b' =< 'bb'], 'bb') (unnecessary duplication), this can simply be $this->base('aa', 'bb'), and the base method takes the key parameters and constructs the needed fields itself.

I'm sure this was a big effort. Thanks for the initiative!

knuckleswtf / scribe