💡 Efficient bulk-loading of morph relations

[rauanmayemir]

I have an idea!

Example relation:

class Parent
{
    #[Cycle\Relation\Morphed\BelongsToMorphed(
        target: ChildInterface::class,
        innerKey: 'child_id',
        morphKey: 'child_type',
    )]
    public ?ChildInterface $child = null;

When querying multiple parents with $select->load('child'), I want cycle to efficiently split up all child_type's and bulk-query each of them. I.e: if I have 50 parents with 20 childs of child1 and 30 childs of child2, it will take only 2 queries to load them: 1 for child1 and 1 for child2.