Add audit trail entity and migration

- Introduced `AuditTrail` entity to track user actions.
- Added Doctrine migration to create the `chill_main_audit_trail` table.

src/Bundle/ChillMainBundle/Entity/AuditTrail.php

@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Entity;
+
+use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping as ORM;
+use Ramsey\Uuid\UuidInterface;
+
+#[ORM\Entity]
+#[ORM\Table(name: 'chill_main_audit_trail')]
+class AuditTrail
+{
+    public function __construct(
+        #[ORM\Id]
+        #[ORM\Column(type: 'uuid', unique: true)]
+        private UuidInterface $id,
+        #[ORM\Column(type: Types::STRING, length: 255)]
+        private string $action,
+        #[ORM\Column(type: Types::DATETIMETZ_IMMUTABLE)]
+        private \DateTimeImmutable $occurredAt,
+        #[ORM\ManyToOne(targetEntity: User::class)]
+        #[ORM\JoinColumn(nullable: true)]
+        private ?User $user = null,
+        #[ORM\Column(type: Types::STRING, length: 255, nullable: false, options: ['default' => ''])]
+        private string $description = '',
+        /**
+         * @var list<array<string, mixed>>
+         */
+        #[ORM\Column(type: Types::JSON, options: ['jsonb' => true, 'default' => "'[]'::jsonb"])]
+        private array $targets = [],
+        /**
+         * @var array<array-key, mixed>
+         */
+        #[ORM\Column(type: Types::JSON, options: ['jsonb' => true, 'default' => "'[]'::jsonb"])]
+        private array $metadata = [],
+    ) {}
+
+    public function getId(): UuidInterface
+    {
+        return $this->id;
+    }
+
+    public function getUser(): User
+    {
+        return $this->user;
+    }
+
+    public function getOccurredAt(): \DateTimeImmutable
+    {
+        return $this->occurredAt;
+    }
+
+    public function getAction(): string
+    {
+        return $this->action;
+    }
+
+    public function getDescription(): ?string
+    {
+        return $this->description;
+    }
+
+    /**
+     * @return list<array<string, mixed>>
+     */
+    public function getTargets(): array
+    {
+        return $this->targets;
+    }
+
+    /**
+     * @return array<array-key, mixed>
+     */
+    public function getMetadata(): array
+    {
+        return $this->metadata;
+    }
+}