Replace custom class discovery with spatie/php-structure-discoverer package

[cweagans]

While

filament/packages/panels/src/Panel/Concerns/HasComponents.php

Line 408 in 2bbfeeb

protected function discoverComponents(string $baseClass, array &$register, ?string $directory, ?string $namespace): void

works great, it seems like https://github.com/spatie/php-structure-discoverer would be a more generalized solution that would also be useful in the event that e.g. I wanted to have an auto-discovery mechanism of my own.

Of course, I can just pull the Spatie package into my project and use it as normal, but it does seem strange to have two different things in my application that discover classes that implement some particular interface.

Does it make sense to replace this function in Filament itself? Happy to do that work if you'd be open to it.