Allow adding custom Macroable classes.

[mathieutu]

Summary

Some packages, like Filament, implements their own version of the Macroable trait.
Spatie even made their own version.

This PR allow adding any macro class we want to detect in the config file.

Thanks,
Mathieu.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist

• Existing tests have been adapted and/or new tests have been added
• Update the README.md
• Code style has been fixed via composer fix-style

[mathieutu]

⚠️ This PR can't be merged as it, because of these lines:

laravel-ide-helper/src/Alias.php

Lines 386 to 387 in 4d2728c

	$traits = collect($reflection->getTraitNames());
	if ($traits->contains('Illuminate\Support\Traits\Macroable') || $class === EloquentBuilder::class) {

There are two problems with them:

• We're not looking for traits recursively, contrary to what is done in the Generator. (Leads to bugs)
• The Macroable class is hardcoded. (Topic of this PR)
• (The code is dupplicated)

I'm ok to continue and make the changes.

However, could you tell me if you're interested in this or not?
If this PR will be closed anyway, I don't invest more time in it.

Thanks!