[5.x] Refactoring of Barry ORM for support data caching

[papac]

The ORM should cache the result on Relationship action for more performance

    /**
     * Get the results of the relationship.
     *
     * @return Model
     */
    public function getResults(): ?Model
    {
        // TODO: Cache the result
        return $this->query->first();
    }

There are methods getResults in each relationship.