(feat) Attribute-driven model casting

[techmahedy]

This PR introduces a fully attribute-driven casting system for entities, replacing the legacy $casts array with a more modern, type-safe, and extensible approach.

use Phaseolies\Database\Entity\Casts\Attributes\ToDateTime;
use Phaseolies\Database\Entity\Casts\Attributes\ToString;

#[ToDateTime]
protected string $joining_date;

#[ToString]
protected string $salary;

All available shorthand attributes:

#[ToString]      protected string  $name;
#[ToInteger]     protected int     $views;
#[ToFloat]       protected float   $weight;
#[ToBoolean]     protected bool    $is_active;
#[ToDate]        protected string  $birthday;
#[ToDateTime]    protected string  $published_at;
#[ToTimestamp]   protected int     $created_at;
#[ToArray]       protected string  $options;
#[ToJson]        protected string  $tags;
#[ToObject]      protected string  $config;
#[ToCollection]  protected string  $images;

Added support for custom and enum casting via the base #[Transform] attribute:

#[Transform('decimal:2')] protected string $price; 

#[Transform(OrderStatus::class)] protected string $status;