Added Validation to API requests.

- Added Symfony Validation Lib.
- Updated API DTOs to include validation constraints.

src/Entity/BookingCustomer.php

@@ -5,6 +5,7 @@ namespace App\Entity;
 use App\Repository\BookingCustomerRepository;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Serializer\Annotation\Ignore;
+use Symfony\Component\Validator\Constraints as Assert;
 
 #[ORM\Entity(repositoryClass: BookingCustomerRepository::class)]
 class BookingCustomer
@@ -21,15 +22,20 @@ class BookingCustomer
     private ?Booking $booking = null;
 
     #[ORM\Column(length: 64)]
+    #[Assert\NotBlank]
     private ?string $name = null;
 
     #[ORM\Column(length: 255)]
+    #[Assert\NotBlank]
     private ?string $surname = null;
 
     #[ORM\Column(length: 255)]
+    #[Assert\NotBlank]
+    #[Assert\Email]
     private ?string $email = null;
 
     #[ORM\Column(length: 255)]
+    #[Assert\NotBlank]
     private ?string $phoneNumber = null;
 
     public function getId(): ?int